<?xml version="1.0" encoding="us-ascii"?>
<!--XBRL document created with Bowne Tagger XBRL Enabler by Bowne Software version 10.0.0.120-->
<!--Based on XBRL 2.1-->
<link:linkbase xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#StatementsOfShareholdersEquity" roleURI="http://eaton.com/role/StatementsOfShareholdersEquity" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#StatementsOfShareholdersEquityParenthetical" roleURI="http://eaton.com/role/StatementsOfShareholdersEquityParenthetical" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#SummaryOfSignificantAccountingPoliciesDetails" roleURI="http://eaton.com/role/SummaryOfSignificantAccountingPoliciesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#AcquisitionsOfBusinessesDetails" roleURI="http://eaton.com/role/AcquisitionsOfBusinessesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#AcquisitionIntegrationAndRestructuringChargesDetails" roleURI="http://eaton.com/role/AcquisitionIntegrationAndRestructuringChargesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#GoodwillAndOtherIntangibleAssetsDetails" roleURI="http://eaton.com/role/GoodwillAndOtherIntangibleAssetsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#DebtDetails" roleURI="http://eaton.com/role/DebtDetails" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#RetirementBenefitPlansDetails" roleURI="http://eaton.com/role/RetirementBenefitPlansDetails" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#RetirementBenefitPlansDetails1" roleURI="http://eaton.com/role/RetirementBenefitPlansDetails1" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#RetirementBenefitPlansDetails2" roleURI="http://eaton.com/role/RetirementBenefitPlansDetails2" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#IncomeTaxesDetails" roleURI="http://eaton.com/role/IncomeTaxesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#IncomeTaxesDetails1" roleURI="http://eaton.com/role/IncomeTaxesDetails1" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#IncomeTaxesDetails2" roleURI="http://eaton.com/role/IncomeTaxesDetails2" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#IncomeTaxesDetails3" roleURI="http://eaton.com/role/IncomeTaxesDetails3" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#StockOptionsAndRestrictedUnitsDetails" roleURI="http://eaton.com/role/StockOptionsAndRestrictedUnitsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#FairValueMeasurementsDetails" roleURI="http://eaton.com/role/FairValueMeasurementsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#FairValueMeasurementsDetails1" roleURI="http://eaton.com/role/FairValueMeasurementsDetails1" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#DerivativeInstrumentsAndHedgingActivitiesDetails" roleURI="http://eaton.com/role/DerivativeInstrumentsAndHedgingActivitiesDetails" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#DerivativeInstrumentsAndHedgingActivitiesDetails1" roleURI="http://eaton.com/role/DerivativeInstrumentsAndHedgingActivitiesDetails1" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#BusinessSegmentAndGeographicRegionInformationDetails1" roleURI="http://eaton.com/role/BusinessSegmentAndGeographicRegionInformationDetails1" />
  <link:roleRef xlink:type="simple" xlink:href="etn-20101231.xsd#BusinessSegmentAndGeographicRegionInformationDetails" roleURI="http://eaton.com/role/BusinessSegmentAndGeographicRegionInformationDetails" />
  <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" />
  <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" />
  <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" />
  <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" />
  <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all" />
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/StatementsOfShareholdersEquity" xlink:title="0140 - Statement - Consolidated Statements of Shareholders' Equity">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="us-gaap_StatementEquityComponentsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="us-gaap_EquityComponentDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ParentMember" xlink:label="us-gaap_ParentMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommonStockMember" xlink:label="us-gaap_CommonStockMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="us-gaap_AdditionalPaidInCapitalMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="us-gaap_RetainedEarningsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredCompensationShareBasedPaymentsMember" xlink:label="us-gaap_DeferredCompensationShareBasedPaymentsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="us-gaap_NoncontrollingInterestMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SharesIssued" xlink:label="us-gaap_SharesIssued" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ProfitLoss" xlink:label="us-gaap_ProfitLoss" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPeriodIncreaseDecrease" xlink:label="us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPeriodIncreaseDecrease" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OtherComprehensiveIncomePensionNetOfTax" xlink:label="etn_OtherComprehensiveIncomePensionNetOfTax" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OtherComprehensiveIncomeOtherPostretirementBenefitNetOfTax" xlink:label="etn_OtherComprehensiveIncomeOtherPostretirementBenefitNetOfTax" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease" xlink:label="us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OtherComprehensiveIncomeLoss" xlink:label="etn_OtherComprehensiveIncomeLoss" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_TotalComprehensiveIncomeLoss" xlink:label="etn_TotalComprehensiveIncomeLoss" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EffectOnRetainedEarningsAccumulatedDeficitDueToChangeInMeasurementDateNetOfTax" xlink:label="us-gaap_EffectOnRetainedEarningsAccumulatedDeficitDueToChangeInMeasurementDateNetOfTax" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DividendsCommonStockCash" xlink:label="us-gaap_DividendsCommonStockCash" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue" xlink:label="us-gaap_StockRepurchasedAndRetiredDuringPeriodValue" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares" xlink:label="us-gaap_StockRepurchasedAndRetiredDuringPeriodShares" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MinorityInterestIncreaseFromStockIssuance" xlink:label="us-gaap_MinorityInterestIncreaseFromStockIssuance" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementEquityComponentsAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_ParentMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ParentMember" xlink:to="us-gaap_CommonStockMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ParentMember" xlink:to="us-gaap_AdditionalPaidInCapitalMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ParentMember" xlink:to="us-gaap_RetainedEarningsMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ParentMember" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ParentMember" xlink:to="us-gaap_DeferredCompensationShareBasedPaymentsMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ParentMember" xlink:to="us-gaap_NoncontrollingInterestMember" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_SharesIssued" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_ProfitLoss" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPeriodIncreaseDecrease" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="etn_OtherComprehensiveIncomePensionNetOfTax" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="etn_OtherComprehensiveIncomeOtherPostretirementBenefitNetOfTax" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="etn_OtherComprehensiveIncomeLoss" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="etn_TotalComprehensiveIncomeLoss" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_EffectOnRetainedEarningsAccumulatedDeficitDueToChangeInMeasurementDateNetOfTax" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_DividendsCommonStockCash" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodValueNewIssues" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodSharesNewIssues" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockRepurchasedAndRetiredDuringPeriodValue" order="16" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockRepurchasedAndRetiredDuringPeriodShares" order="17" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_MinorityInterestIncreaseFromStockIssuance" order="18" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/StatementsOfShareholdersEquity" xlink:title="0140 - Statement - Consolidated Statements of Shareholders' Equity">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="us-gaap_StatementEquityComponentsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="us-gaap_EquityComponentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/StatementsOfShareholdersEquityParenthetical" xlink:title="0141 - Statement - Consolidated Statements of Shareholders' Equity (Parenthetical)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="us-gaap_StatementEquityComponentsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="us-gaap_EquityComponentDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ParentMember" xlink:label="us-gaap_ParentMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommonStockMember" xlink:label="us-gaap_CommonStockMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="us-gaap_AdditionalPaidInCapitalMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="us-gaap_RetainedEarningsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredCompensationShareBasedPaymentsMember" xlink:label="us-gaap_DeferredCompensationShareBasedPaymentsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTax" xlink:label="us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTax" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentTax" xlink:label="us-gaap_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentTax" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax" xlink:label="us-gaap_OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease" xlink:label="us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_IncomeTaxBenefitOnEffectsOfChangingRetirementBenefitsPlans" xlink:label="etn_IncomeTaxBenefitOnEffectsOfChangingRetirementBenefitsPlans" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementEquityComponentsAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_ParentMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ParentMember" xlink:to="us-gaap_CommonStockMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ParentMember" xlink:to="us-gaap_AdditionalPaidInCapitalMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ParentMember" xlink:to="us-gaap_RetainedEarningsMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ParentMember" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ParentMember" xlink:to="us-gaap_DeferredCompensationShareBasedPaymentsMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTax" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentTax" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="etn_IncomeTaxBenefitOnEffectsOfChangingRetirementBenefitsPlans" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" order="6" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/StatementsOfShareholdersEquityParenthetical" xlink:title="0141 - Statement - Consolidated Statements of Shareholders' Equity (Parenthetical)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="us-gaap_StatementEquityComponentsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="us-gaap_EquityComponentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:title="0601 - Disclosure - Summary of Significant Accounting Policies (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PatentedTechnologyMember" xlink:label="us-gaap_PatentedTechnologyMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="us-gaap_CustomerRelationshipsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SoftwareMember" xlink:label="us-gaap_SoftwareMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MachineryAndEquipmentMember" xlink:label="us-gaap_MachineryAndEquipmentMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_BuildingMember" xlink:label="us-gaap_BuildingMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="us-gaap_FiniteLivedIntangibleAssetsLineItems" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SummaryOfSignificantAccountingPoliciesTextualAbstract" xlink:label="etn_SummaryOfSignificantAccountingPoliciesTextualAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="us-gaap_FiniteLivedIntangibleAssetsWeightedAverageUsefulLife" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable" xlink:to="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="us-gaap_PatentedTechnologyMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="us-gaap_CustomerRelationshipsMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="us-gaap_SoftwareMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable" xlink:to="us-gaap_PropertyPlantAndEquipmentByTypeAxis" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_MachineryAndEquipmentMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_BuildingMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:to="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable" order="3" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:to="etn_SummaryOfSignificantAccountingPoliciesTextualAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_SummaryOfSignificantAccountingPoliciesTextualAbstract" xlink:to="us-gaap_FiniteLivedIntangibleAssetsWeightedAverageUsefulLife" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:title="0601 - Disclosure - Summary of Significant Accounting Policies (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:title="0601 - Disclosure - Summary of Significant Accounting Policies (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:title="0601 - Disclosure - Summary of Significant Accounting Policies (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MachineryAndEquipmentMember" xlink:label="us-gaap_MachineryAndEquipmentMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_BuildingMember" xlink:label="us-gaap_BuildingMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="us-gaap_PropertyPlantAndEquipmentLineItems" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SummaryOfSignificantAccountingPoliciesTextualsAbstract" xlink:label="etn_SummaryOfSignificantAccountingPoliciesTextualsAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLifeMaximum" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLifeMaximum" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLifeMinimum" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLifeMinimum" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:to="us-gaap_PropertyPlantAndEquipmentByTypeAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_PropertyPlantAndEquipmentLineItems" xlink:to="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentLineItems" xlink:to="etn_SummaryOfSignificantAccountingPoliciesTextualsAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_SummaryOfSignificantAccountingPoliciesTextualsAbstract" xlink:to="us-gaap_PropertyPlantAndEquipmentUsefulLifeMaximum" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_SummaryOfSignificantAccountingPoliciesTextualsAbstract" xlink:to="us-gaap_PropertyPlantAndEquipmentUsefulLifeMinimum" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:title="0601 - Disclosure - Summary of Significant Accounting Policies (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/AcquisitionsOfBusinessesDetails" xlink:title="0602 - Disclosure - Acquisitions of Businesses (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="us-gaap_BusinessAcquisitionAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_BusinessAcquisitionOneMember" xlink:label="etn_BusinessAcquisitionOneMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_BusinessAcquisitionThreeMember" xlink:label="etn_BusinessAcquisitionThreeMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_BusinessAcquisitionTwoMember" xlink:label="etn_BusinessAcquisitionTwoMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_BusinessAcquisitionFourMember" xlink:label="etn_BusinessAcquisitionFourMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_BusinessAcquisitionSixMember" xlink:label="etn_BusinessAcquisitionSixMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_BusinessAcquisitionSevenMember" xlink:label="etn_BusinessAcquisitionSevenMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_BusinessAcquisitionEightMember" xlink:label="etn_BusinessAcquisitionEightMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_BusinessAcquisitionNineMember" xlink:label="etn_BusinessAcquisitionNineMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_BusinessAcquisitionElevenMember" xlink:label="etn_BusinessAcquisitionElevenMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_BusinessAcquisitionTwelveMember" xlink:label="etn_BusinessAcquisitionTwelveMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_JointVentureAgreementMember" xlink:label="etn_JointVentureAgreementMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_BusinessAcquisitionTenMember" xlink:label="etn_BusinessAcquisitionTenMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_BusinessAcquisitionThirteenMember" xlink:label="etn_BusinessAcquisitionThirteenMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_TuthillCouplingGroupMember" xlink:label="etn_TuthillCouplingGroupMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ActomPtyLimitedMember" xlink:label="etn_ActomPtyLimitedMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_CopperLogicIncMember" xlink:label="etn_CopperLogicIncMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="us-gaap_StatementBusinessSegmentsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentBusinessDomain" xlink:label="us-gaap_SegmentBusinessDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentThreeMember" xlink:label="etn_SegmentThreeMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentTwoMember" xlink:label="etn_SegmentTwoMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentOneMember" xlink:label="etn_SegmentOneMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentFourMember" xlink:label="etn_SegmentFourMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentFiveMember" xlink:label="etn_SegmentFiveMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="us-gaap_BusinessAcquisitionLineItems" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DescriptionOfAnnualSalesFromAcquiredEntityFromPreviousPeriodsAbstract" xlink:label="etn_DescriptionOfAnnualSalesFromAcquiredEntityFromPreviousPeriodsAbstract" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SalesOfAcquiredBusinesses" xlink:label="etn_SalesOfAcquiredBusinesses" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_NewJointVenture" xlink:label="etn_NewJointVenture" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_AcquisitionsOfBusinessesTextualsAbstract" xlink:label="etn_AcquisitionsOfBusinessesTextualsAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage" xlink:label="us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_BusinessAcquisitionEquityInterestAfterAcquisition" xlink:label="etn_BusinessAcquisitionEquityInterestAfterAcquisition" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OwnershipInJointVenturePercent" xlink:label="etn_OwnershipInJointVenturePercent" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice" xlink:label="us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="us-gaap_BusinessAcquisitionAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_BusinessAcquisitionAxis" xlink:to="us-gaap_BusinessAcquisitionAcquireeDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="etn_BusinessAcquisitionOneMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="etn_BusinessAcquisitionThreeMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="etn_BusinessAcquisitionTwoMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="etn_BusinessAcquisitionFourMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="etn_BusinessAcquisitionSixMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="etn_BusinessAcquisitionSevenMember" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="etn_BusinessAcquisitionEightMember" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="etn_BusinessAcquisitionNineMember" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="etn_BusinessAcquisitionElevenMember" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="etn_BusinessAcquisitionTwelveMember" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="etn_JointVentureAgreementMember" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="etn_BusinessAcquisitionTenMember" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="etn_BusinessAcquisitionThirteenMember" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="etn_TuthillCouplingGroupMember" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="etn_ActomPtyLimitedMember" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="etn_CopperLogicIncMember" order="16" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="us-gaap_StatementBusinessSegmentsAxis" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentBusinessDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentThreeMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentTwoMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentOneMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentFourMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentFiveMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" order="3" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="etn_DescriptionOfAnnualSalesFromAcquiredEntityFromPreviousPeriodsAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DescriptionOfAnnualSalesFromAcquiredEntityFromPreviousPeriodsAbstract" xlink:to="etn_SalesOfAcquiredBusinesses" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DescriptionOfAnnualSalesFromAcquiredEntityFromPreviousPeriodsAbstract" xlink:to="etn_NewJointVenture" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="etn_AcquisitionsOfBusinessesTextualsAbstract" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_AcquisitionsOfBusinessesTextualsAbstract" xlink:to="us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_AcquisitionsOfBusinessesTextualsAbstract" xlink:to="etn_BusinessAcquisitionEquityInterestAfterAcquisition" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_AcquisitionsOfBusinessesTextualsAbstract" xlink:to="etn_OwnershipInJointVenturePercent" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_AcquisitionsOfBusinessesTextualsAbstract" xlink:to="us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice" order="4" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/AcquisitionsOfBusinessesDetails" xlink:title="0602 - Disclosure - Acquisitions of Businesses (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="us-gaap_BusinessAcquisitionAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_BusinessAcquisitionAxis" xlink:to="us-gaap_BusinessAcquisitionAcquireeDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/AcquisitionsOfBusinessesDetails" xlink:title="0602 - Disclosure - Acquisitions of Businesses (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="us-gaap_StatementBusinessSegmentsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentBusinessDomain" xlink:label="us-gaap_SegmentBusinessDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentBusinessDomain" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/AcquisitionIntegrationAndRestructuringChargesDetails" xlink:title="0603 - Disclosure - Acquisition Integration and Restructuring Charges (Details)">
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ScheduleOfAcquisitionIntegrationChargesTable" xlink:label="etn_ScheduleOfAcquisitionIntegrationChargesTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="us-gaap_StatementBusinessSegmentsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentBusinessDomain" xlink:label="us-gaap_SegmentBusinessDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentOneMember" xlink:label="etn_SegmentOneMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentTwoMember" xlink:label="etn_SegmentTwoMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentThreeMember" xlink:label="etn_SegmentThreeMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentFourMember" xlink:label="etn_SegmentFourMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentFiveMember" xlink:label="etn_SegmentFiveMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_AllSegmentsMember" xlink:label="etn_AllSegmentsMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentSixMember" xlink:label="etn_SegmentSixMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_AcquisitionIntegrationChargesLineItems" xlink:label="etn_AcquisitionIntegrationChargesLineItems" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_AcquisitionIntegrationChargesAbstract" xlink:label="etn_AcquisitionIntegrationChargesAbstract" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_AcquisitionIntegrationPretaxCharges" xlink:label="etn_AcquisitionIntegrationPretaxCharges" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_AcquisitionIntegrationAfterTaxCharges" xlink:label="etn_AcquisitionIntegrationAfterTaxCharges" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_AcquisitionIntegrationChargesPerCommonShare" xlink:label="etn_AcquisitionIntegrationChargesPerCommonShare" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="etn_ScheduleOfAcquisitionIntegrationChargesTable" xlink:to="us-gaap_StatementBusinessSegmentsAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentBusinessDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentOneMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentTwoMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentThreeMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentFourMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentFiveMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_AllSegmentsMember" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentSixMember" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="etn_AcquisitionIntegrationChargesLineItems" xlink:to="etn_ScheduleOfAcquisitionIntegrationChargesTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_AcquisitionIntegrationChargesLineItems" xlink:to="etn_AcquisitionIntegrationChargesAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_AcquisitionIntegrationChargesAbstract" xlink:to="etn_AcquisitionIntegrationPretaxCharges" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_AcquisitionIntegrationChargesAbstract" xlink:to="etn_AcquisitionIntegrationAfterTaxCharges" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_AcquisitionIntegrationChargesAbstract" xlink:to="etn_AcquisitionIntegrationChargesPerCommonShare" order="3" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/AcquisitionIntegrationAndRestructuringChargesDetails" xlink:title="0603 - Disclosure - Acquisition Integration and Restructuring Charges (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="us-gaap_StatementBusinessSegmentsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentBusinessDomain" xlink:label="us-gaap_SegmentBusinessDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentBusinessDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/AcquisitionIntegrationAndRestructuringChargesDetails" xlink:title="0603 - Disclosure - Acquisition Integration and Restructuring Charges (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfRestructuringReserveByTypeOfRestructuringTable" xlink:label="us-gaap_ScheduleOfRestructuringReserveByTypeOfRestructuringTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RestructuringReserveByTypeOfRestructuringAxis" xlink:label="us-gaap_RestructuringReserveByTypeOfRestructuringAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="us-gaap_TypeOfRestructuringDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EmployeeSeveranceMember" xlink:label="us-gaap_EmployeeSeveranceMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FacilityClosingMember" xlink:label="us-gaap_FacilityClosingMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RestructuringReserveLineItems" xlink:label="us-gaap_RestructuringReserveLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RestructuringReserveRollForward" xlink:label="us-gaap_RestructuringReserveRollForward" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_RestructuringReserveEmployees" xlink:label="etn_RestructuringReserveEmployees" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RestructuringReserve" xlink:label="us-gaap_RestructuringReserve" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_LiabilitiesRecognizedEmployees" xlink:label="etn_LiabilitiesRecognizedEmployees" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_LiabilitiesRecognized" xlink:label="etn_LiabilitiesRecognized" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_UtilizationOfVariousComponentsEmployees" xlink:label="etn_UtilizationOfVariousComponentsEmployees" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_UtilizationOfVariousComponents" xlink:label="etn_UtilizationOfVariousComponents" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfRestructuringReserveByTypeOfRestructuringTable" xlink:to="us-gaap_RestructuringReserveByTypeOfRestructuringAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RestructuringReserveByTypeOfRestructuringAxis" xlink:to="us-gaap_TypeOfRestructuringDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TypeOfRestructuringDomain" xlink:to="us-gaap_EmployeeSeveranceMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TypeOfRestructuringDomain" xlink:to="us-gaap_FacilityClosingMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_RestructuringReserveLineItems" xlink:to="us-gaap_ScheduleOfRestructuringReserveByTypeOfRestructuringTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RestructuringReserveLineItems" xlink:to="us-gaap_RestructuringReserveRollForward" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RestructuringReserveRollForward" xlink:to="etn_RestructuringReserveEmployees" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RestructuringReserveRollForward" xlink:to="us-gaap_RestructuringReserve" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RestructuringReserveRollForward" xlink:to="etn_LiabilitiesRecognizedEmployees" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RestructuringReserveRollForward" xlink:to="etn_LiabilitiesRecognized" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RestructuringReserveRollForward" xlink:to="etn_UtilizationOfVariousComponentsEmployees" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RestructuringReserveRollForward" xlink:to="etn_UtilizationOfVariousComponents" order="6" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/AcquisitionIntegrationAndRestructuringChargesDetails" xlink:title="0603 - Disclosure - Acquisition Integration and Restructuring Charges (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RestructuringReserveByTypeOfRestructuringAxis" xlink:label="us-gaap_RestructuringReserveByTypeOfRestructuringAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="us-gaap_TypeOfRestructuringDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_RestructuringReserveByTypeOfRestructuringAxis" xlink:to="us-gaap_TypeOfRestructuringDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/GoodwillAndOtherIntangibleAssetsDetails" xlink:title="0604 - Disclosure - Goodwill and Other Intangible Assets (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="us-gaap_CustomerRelationshipsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PatentedTechnologyMember" xlink:label="us-gaap_PatentedTechnologyMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_PatentsAndTechnologyMember" xlink:label="etn_PatentsAndTechnologyMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_FiniteLivedIntangibleAssetsOtherMember" xlink:label="etn_FiniteLivedIntangibleAssetsOtherMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="us-gaap_FiniteLivedIntangibleAssetsLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract" xlink:label="us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill" xlink:label="us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNetAbstract" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNetAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="us-gaap_FiniteLivedIntangibleAssetsGross" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable" xlink:to="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="us-gaap_CustomerRelationshipsMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="us-gaap_PatentedTechnologyMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="etn_PatentsAndTechnologyMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="etn_FiniteLivedIntangibleAssetsOtherMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:to="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsByMajorClassTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:to="us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract" xlink:to="us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract" xlink:to="us-gaap_FiniteLivedIntangibleAssetsNetAbstract" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsNetAbstract" xlink:to="us-gaap_FiniteLivedIntangibleAssetsGross" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsNetAbstract" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/GoodwillAndOtherIntangibleAssetsDetails" xlink:title="0604 - Disclosure - Goodwill and Other Intangible Assets (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/GoodwillAndOtherIntangibleAssetsDetails" xlink:title="0604 - Disclosure - Goodwill and Other Intangible Assets (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="us-gaap_ScheduleOfGoodwillTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="us-gaap_StatementBusinessSegmentsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentBusinessDomain" xlink:label="us-gaap_SegmentBusinessDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentFourMember" xlink:label="etn_SegmentFourMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentOneMember" xlink:label="etn_SegmentOneMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentTwoMember" xlink:label="etn_SegmentTwoMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentFiveMember" xlink:label="etn_SegmentFiveMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_TruckMember" xlink:label="etn_TruckMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentThreeMember" xlink:label="etn_SegmentThreeMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="us-gaap_GoodwillLineItems" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ScheduleOfGoodwillAbstract" xlink:label="etn_ScheduleOfGoodwillAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_Goodwill" xlink:label="us-gaap_Goodwill" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfGoodwillTable" xlink:to="us-gaap_StatementBusinessSegmentsAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentBusinessDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentFourMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentOneMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentTwoMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentFiveMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_TruckMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentThreeMember" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_GoodwillLineItems" xlink:to="us-gaap_ScheduleOfGoodwillTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_GoodwillLineItems" xlink:to="etn_ScheduleOfGoodwillAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_ScheduleOfGoodwillAbstract" xlink:to="us-gaap_Goodwill" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/GoodwillAndOtherIntangibleAssetsDetails" xlink:title="0604 - Disclosure - Goodwill and Other Intangible Assets (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="us-gaap_StatementBusinessSegmentsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentBusinessDomain" xlink:label="us-gaap_SegmentBusinessDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentBusinessDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/DebtDetails" xlink:title="0605 - Disclosure - Debt (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="us-gaap_DebtInstrumentTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="us-gaap_LongtermDebtTypeAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note5Point75PercentageDue2012Member" xlink:label="etn_Note5Point75PercentageDue2012Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note7Point58PercentageDue2012Member" xlink:label="etn_Note7Point58PercentageDue2012Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note4Point9PercentageDue2013Member" xlink:label="etn_Note4Point9PercentageDue2013Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note5Point80PercentageDue2013Member" xlink:label="etn_Note5Point80PercentageDue2013Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note5Point95PercentageDue2014Member" xlink:label="etn_Note5Point95PercentageDue2014Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Debentures12Point5PercentageDue2014Member" xlink:label="etn_Debentures12Point5PercentageDue2014Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note4Point65PercentageDue2015Member" xlink:label="etn_Note4Point65PercentageDue2015Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note5Point3PercentageDue2017Member" xlink:label="etn_Note5Point3PercentageDue2017Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note6Point875PercentageTo7Point09PercentageDue2018Member" xlink:label="etn_Note6Point875PercentageTo7Point09PercentageDue2018Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note5Point6PercentageDue2018Member" xlink:label="etn_Note5Point6PercentageDue2018Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note4Point215PercentageDue2018Member" xlink:label="etn_Note4Point215PercentageDue2018Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note6Point95PercentageDue2019Member" xlink:label="etn_Note6Point95PercentageDue2019Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Debentures8Point875PercentageDue2019Member" xlink:label="etn_Debentures8Point875PercentageDue2019Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note8Point10PercentageDue2022Member" xlink:label="etn_Note8Point10PercentageDue2022Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Debentures7Point625PercentageDue2024Member" xlink:label="etn_Debentures7Point625PercentageDue2024Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Debentures6Point5PercentageDue2025Member" xlink:label="etn_Debentures6Point5PercentageDue2025Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Debentures7Point875PercentageDue2026Member" xlink:label="etn_Debentures7Point875PercentageDue2026Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Debentures7Point65PercentageDue2029Member" xlink:label="etn_Debentures7Point65PercentageDue2029Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Debentures5Point45PercentageDue2034Member" xlink:label="etn_Debentures5Point45PercentageDue2034Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note5Point25PercentageDue2035Member" xlink:label="etn_Note5Point25PercentageDue2035Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note5Point8PercentageDue2037Member" xlink:label="etn_Note5Point8PercentageDue2037Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OtherLongTermDebtMember" xlink:label="etn_OtherLongTermDebtMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="us-gaap_DebtInstrumentLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsAbstract" xlink:label="us-gaap_LongTermDebtAndCapitalLeaseObligationsAbstract" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_LongTermDebtAndCapitalLeaseObligation" xlink:label="etn_LongTermDebtAndCapitalLeaseObligation" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent" xlink:label="us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="us-gaap_LongTermDebtAndCapitalLeaseObligations" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DebtInstrumentConvertedFaceAmount" xlink:label="etn_DebtInstrumentConvertedFaceAmount" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_LongtermDebtTypeAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_LongtermDebtTypeAxis" xlink:to="us-gaap_LongtermDebtTypeDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note5Point75PercentageDue2012Member" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note7Point58PercentageDue2012Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note4Point9PercentageDue2013Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note5Point80PercentageDue2013Member" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note5Point95PercentageDue2014Member" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Debentures12Point5PercentageDue2014Member" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note4Point65PercentageDue2015Member" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note5Point3PercentageDue2017Member" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note6Point875PercentageTo7Point09PercentageDue2018Member" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note5Point6PercentageDue2018Member" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note4Point215PercentageDue2018Member" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note6Point95PercentageDue2019Member" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Debentures8Point875PercentageDue2019Member" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note8Point10PercentageDue2022Member" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Debentures7Point625PercentageDue2024Member" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Debentures6Point5PercentageDue2025Member" order="16" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Debentures7Point875PercentageDue2026Member" order="17" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Debentures7Point65PercentageDue2029Member" order="18" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Debentures5Point45PercentageDue2034Member" order="19" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note5Point25PercentageDue2035Member" order="20" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note5Point8PercentageDue2037Member" order="21" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_OtherLongTermDebtMember" order="22" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_LongTermDebtAndCapitalLeaseObligationsAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongTermDebtAndCapitalLeaseObligationsAbstract" xlink:to="etn_LongTermDebtAndCapitalLeaseObligation" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongTermDebtAndCapitalLeaseObligationsAbstract" xlink:to="us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongTermDebtAndCapitalLeaseObligationsAbstract" xlink:to="us-gaap_LongTermDebtAndCapitalLeaseObligations" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="etn_DebtInstrumentConvertedFaceAmount" order="5" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/DebtDetails" xlink:title="0605 - Disclosure - Debt (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="us-gaap_LongtermDebtTypeAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_LongtermDebtTypeAxis" xlink:to="us-gaap_LongtermDebtTypeDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/DebtDetails" xlink:title="0605 - Disclosure - Debt (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfShortTermDebtTable" xlink:label="us-gaap_ScheduleOfShortTermDebtTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="us-gaap_StatementGeographicalAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="us-gaap_SegmentGeographicalDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_UnitedStatesMember" xlink:label="etn_UnitedStatesMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OtherShortTermDebtUnitedStatesMember" xlink:label="etn_OtherShortTermDebtUnitedStatesMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ForeignCountriesMember" xlink:label="etn_ForeignCountriesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="us-gaap_ShortTermDebtTypeAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="us-gaap_ShortTermDebtTypeDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommercialPaperMember" xlink:label="us-gaap_CommercialPaperMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="us-gaap_LineOfCreditMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShortTermDebtLineItems" xlink:label="us-gaap_ShortTermDebtLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShortTermDebtWeightedAverageInterestRate" xlink:label="us-gaap_ShortTermDebtWeightedAverageInterestRate" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommercialPaper" xlink:label="us-gaap_CommercialPaper" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShortTermBorrowings" xlink:label="us-gaap_ShortTermBorrowings" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfShortTermDebtTable" xlink:to="us-gaap_StatementGeographicalAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementGeographicalAxis" xlink:to="us-gaap_SegmentGeographicalDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentGeographicalDomain" xlink:to="etn_UnitedStatesMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentGeographicalDomain" xlink:to="etn_OtherShortTermDebtUnitedStatesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentGeographicalDomain" xlink:to="etn_ForeignCountriesMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfShortTermDebtTable" xlink:to="us-gaap_ShortTermDebtTypeAxis" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_ShortTermDebtTypeAxis" xlink:to="us-gaap_ShortTermDebtTypeDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="us-gaap_CommercialPaperMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="us-gaap_LineOfCreditMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_ShortTermDebtLineItems" xlink:to="us-gaap_ScheduleOfShortTermDebtTable" order="3" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShortTermDebtLineItems" xlink:to="us-gaap_ShortTermDebtWeightedAverageInterestRate" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShortTermDebtLineItems" xlink:to="us-gaap_CommercialPaper" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShortTermDebtLineItems" xlink:to="us-gaap_ShortTermBorrowings" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShortTermDebtLineItems" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" order="4" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/DebtDetails" xlink:title="0605 - Disclosure - Debt (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="us-gaap_StatementGeographicalAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="us-gaap_SegmentGeographicalDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementGeographicalAxis" xlink:to="us-gaap_SegmentGeographicalDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/DebtDetails" xlink:title="0605 - Disclosure - Debt (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="us-gaap_ShortTermDebtTypeAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="us-gaap_ShortTermDebtTypeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_ShortTermDebtTypeAxis" xlink:to="us-gaap_ShortTermDebtTypeDomain" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/RetirementBenefitPlansDetails" xlink:title="0606 - Disclosure - Retirement Benefit Plans (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlansByInvesteeAxis" xlink:label="etn_DefinedBenefitPlansByInvesteeAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlansByInvesteeDomain" xlink:label="etn_DefinedBenefitPlansByInvesteeDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_CommonCollectiveTrustsMember" xlink:label="etn_CommonCollectiveTrustsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="us-gaap_DefinedBenefitPlansDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="us-gaap_PensionPlansDefinedBenefitMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember" xlink:label="us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ForeignPensionPlansDefinedBenefitMember" xlink:label="us-gaap_ForeignPensionPlansDefinedBenefitMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_UKPensionPlanMember" xlink:label="etn_UKPensionPlanMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_UnitedStatesAndNonUnitedStatesPlansWeightedAverageMember" xlink:label="etn_UnitedStatesAndNonUnitedStatesPlansWeightedAverageMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" xlink:label="us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValuePlanAssetMeasurementDomain" xlink:label="us-gaap_FairValuePlanAssetMeasurementDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="us-gaap_FairValueInputsLevel1Member" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="us-gaap_FairValueInputsLevel2Member" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="us-gaap_FairValueInputsLevel3Member" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:label="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="us-gaap_PlanAssetCategoriesDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OtherPlanAssetMember" xlink:label="etn_OtherPlanAssetMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OtherFixedIncomeMember" xlink:label="etn_OtherFixedIncomeMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DomesticSecuritiesMember" xlink:label="etn_DomesticSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ForeignEquitySecuritiesMember" xlink:label="etn_ForeignEquitySecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FixedIncomeSecuritiesMember" xlink:label="us-gaap_FixedIncomeSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_LongDurationFundsMember" xlink:label="etn_LongDurationFundsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CashAndCashEquivalentsMember" xlink:label="us-gaap_CashAndCashEquivalentsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_USTreasurySecuritiesMember" xlink:label="us-gaap_USTreasurySecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_RegisteredInvestmentCompaniesMember" xlink:label="etn_RegisteredInvestmentCompaniesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="us-gaap_EquitySecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RealEstateMember" xlink:label="us-gaap_RealEstateMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="us-gaap_DebtSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="us-gaap_DefinedBenefitPlanDisclosureLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlanAbstract" xlink:label="us-gaap_DefinedBenefitPlanFundedStatusOfPlanAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation" xlink:label="us-gaap_DefinedBenefitPlanBenefitObligation" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan" xlink:label="us-gaap_DefinedBenefitPlanFundedStatusOfPlan" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract" xlink:label="us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent" xlink:label="us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities" xlink:label="us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" xlink:label="us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet" xlink:label="us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract" xlink:label="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax" xlink:label="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax" xlink:label="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax" xlink:label="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:to="etn_DefinedBenefitPlansByInvesteeAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="etn_DefinedBenefitPlansByInvesteeAxis" xlink:to="etn_DefinedBenefitPlansByInvesteeDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlansByInvesteeDomain" xlink:to="etn_CommonCollectiveTrustsMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:to="us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:to="us-gaap_DefinedBenefitPlansDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="us-gaap_PensionPlansDefinedBenefitMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="us-gaap_ForeignPensionPlansDefinedBenefitMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="etn_UKPensionPlanMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="etn_UnitedStatesAndNonUnitedStatesPlansWeightedAverageMember" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:to="us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" xlink:to="us-gaap_FairValuePlanAssetMeasurementDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValuePlanAssetMeasurementDomain" xlink:to="us-gaap_FairValueInputsLevel1Member" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValuePlanAssetMeasurementDomain" xlink:to="us-gaap_FairValueInputsLevel2Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValuePlanAssetMeasurementDomain" xlink:to="us-gaap_FairValueInputsLevel3Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:to="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:to="us-gaap_PlanAssetCategoriesDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_OtherPlanAssetMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_OtherFixedIncomeMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_DomesticSecuritiesMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_ForeignEquitySecuritiesMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_FixedIncomeSecuritiesMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_LongDurationFundsMember" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_CashAndCashEquivalentsMember" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_USTreasurySecuritiesMember" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_RegisteredInvestmentCompaniesMember" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_EquitySecuritiesMember" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_RealEstateMember" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_DebtSecuritiesMember" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanFundedStatusOfPlanAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanFundedStatusOfPlanAbstract" xlink:to="us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanFundedStatusOfPlanAbstract" xlink:to="us-gaap_DefinedBenefitPlanBenefitObligation" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanFundedStatusOfPlanAbstract" xlink:to="us-gaap_DefinedBenefitPlanFundedStatusOfPlan" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract" xlink:to="us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract" xlink:to="us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract" xlink:to="us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract" xlink:to="us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract" xlink:to="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract" xlink:to="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract" xlink:to="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax" order="3" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/RetirementBenefitPlansDetails" xlink:title="0606 - Disclosure - Retirement Benefit Plans (Details)">
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlansByInvesteeAxis" xlink:label="etn_DefinedBenefitPlansByInvesteeAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlansByInvesteeDomain" xlink:label="etn_DefinedBenefitPlansByInvesteeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="etn_DefinedBenefitPlansByInvesteeAxis" xlink:to="etn_DefinedBenefitPlansByInvesteeDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/RetirementBenefitPlansDetails" xlink:title="0606 - Disclosure - Retirement Benefit Plans (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="us-gaap_DefinedBenefitPlansDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:to="us-gaap_DefinedBenefitPlansDomain" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/RetirementBenefitPlansDetails" xlink:title="0606 - Disclosure - Retirement Benefit Plans (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" xlink:label="us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValuePlanAssetMeasurementDomain" xlink:label="us-gaap_FairValuePlanAssetMeasurementDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" xlink:to="us-gaap_FairValuePlanAssetMeasurementDomain" order="3" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/RetirementBenefitPlansDetails" xlink:title="0606 - Disclosure - Retirement Benefit Plans (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:label="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="us-gaap_PlanAssetCategoriesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:to="us-gaap_PlanAssetCategoriesDomain" order="4" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/RetirementBenefitPlansDetails1" xlink:title="06061 - Disclosure - Retirement Benefit Plans (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlansByInvesteeAxis" xlink:label="etn_DefinedBenefitPlansByInvesteeAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlansByInvesteeDomain" xlink:label="etn_DefinedBenefitPlansByInvesteeDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_CommonCollectiveTrustsMember" xlink:label="etn_CommonCollectiveTrustsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="us-gaap_DefinedBenefitPlansDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="us-gaap_PensionPlansDefinedBenefitMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember" xlink:label="us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ForeignPensionPlansDefinedBenefitMember" xlink:label="us-gaap_ForeignPensionPlansDefinedBenefitMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_UKPensionPlanMember" xlink:label="etn_UKPensionPlanMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_UnitedStatesAndNonUnitedStatesPlansWeightedAverageMember" xlink:label="etn_UnitedStatesAndNonUnitedStatesPlansWeightedAverageMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" xlink:label="us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValuePlanAssetMeasurementDomain" xlink:label="us-gaap_FairValuePlanAssetMeasurementDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="us-gaap_FairValueInputsLevel1Member" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="us-gaap_FairValueInputsLevel2Member" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="us-gaap_FairValueInputsLevel3Member" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:label="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="us-gaap_PlanAssetCategoriesDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OtherPlanAssetMember" xlink:label="etn_OtherPlanAssetMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OtherFixedIncomeMember" xlink:label="etn_OtherFixedIncomeMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DomesticSecuritiesMember" xlink:label="etn_DomesticSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ForeignEquitySecuritiesMember" xlink:label="etn_ForeignEquitySecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FixedIncomeSecuritiesMember" xlink:label="us-gaap_FixedIncomeSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_LongDurationFundsMember" xlink:label="etn_LongDurationFundsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CashAndCashEquivalentsMember" xlink:label="us-gaap_CashAndCashEquivalentsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_USTreasurySecuritiesMember" xlink:label="us-gaap_USTreasurySecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_RegisteredInvestmentCompaniesMember" xlink:label="etn_RegisteredInvestmentCompaniesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="us-gaap_EquitySecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RealEstateMember" xlink:label="us-gaap_RealEstateMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="us-gaap_DebtSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="us-gaap_DefinedBenefitPlanDisclosureLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward" xlink:label="us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation" xlink:label="us-gaap_DefinedBenefitPlanBenefitObligation" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="us-gaap_DefinedBenefitPlanServiceCost" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="us-gaap_DefinedBenefitPlanInterestCost" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanActuarialNetGainsLosses" xlink:label="us-gaap_DefinedBenefitPlanActuarialNetGainsLosses" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitsPaid" xlink:label="us-gaap_DefinedBenefitPlanBenefitsPaid" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation" xlink:label="us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlanOther" xlink:label="etn_DefinedBenefitPlanOther" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation" xlink:label="us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward" xlink:label="us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets" xlink:label="us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer" xlink:label="us-gaap_DefinedBenefitPlanContributionsByEmployer" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesPlanAssets" xlink:label="us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesPlanAssets" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlanOtherAssets" xlink:label="etn_DefinedBenefitPlanOtherAssets" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract" xlink:label="us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation" xlink:label="us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation" xlink:label="us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets" xlink:label="us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax" xlink:label="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeForeignCurrencyTranslation" xlink:label="etn_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeForeignCurrencyTranslation" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeIncludedInExpenses" xlink:label="etn_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeIncludedInExpenses" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeOther" xlink:label="etn_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeOther" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecrease" xlink:label="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecrease" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract" xlink:label="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:label="us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses" xlink:label="us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_TotalBenefitPlans" xlink:label="etn_TotalBenefitPlans" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments" xlink:label="us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements" xlink:label="us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAmountsThatWillBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossInNextFiscalYearAbstract" xlink:label="us-gaap_DefinedBenefitPlanAmountsThatWillBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossInNextFiscalYearAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfNetGainsLosses" xlink:label="us-gaap_DefinedBenefitPlanAmortizationOfNetGainsLosses" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfNetPriorServiceCostCredit" xlink:label="us-gaap_DefinedBenefitPlanAmortizationOfNetPriorServiceCostCredit" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAmountsThatWillBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossInNextFiscalYear" xlink:label="us-gaap_DefinedBenefitPlanAmountsThatWillBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossInNextFiscalYear" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedInCalculationsAbstract" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedInCalculationsAbstract" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlansWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract" xlink:label="etn_DefinedBenefitPlansWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlansWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract" xlink:label="etn_DefinedBenefitPlansWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:to="etn_DefinedBenefitPlansByInvesteeAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="etn_DefinedBenefitPlansByInvesteeAxis" xlink:to="etn_DefinedBenefitPlansByInvesteeDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlansByInvesteeDomain" xlink:to="etn_CommonCollectiveTrustsMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:to="us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:to="us-gaap_DefinedBenefitPlansDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="us-gaap_PensionPlansDefinedBenefitMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="us-gaap_ForeignPensionPlansDefinedBenefitMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="etn_UKPensionPlanMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="etn_UnitedStatesAndNonUnitedStatesPlansWeightedAverageMember" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:to="us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" xlink:to="us-gaap_FairValuePlanAssetMeasurementDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValuePlanAssetMeasurementDomain" xlink:to="us-gaap_FairValueInputsLevel1Member" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValuePlanAssetMeasurementDomain" xlink:to="us-gaap_FairValueInputsLevel2Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValuePlanAssetMeasurementDomain" xlink:to="us-gaap_FairValueInputsLevel3Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:to="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:to="us-gaap_PlanAssetCategoriesDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_OtherPlanAssetMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_OtherFixedIncomeMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_DomesticSecuritiesMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_ForeignEquitySecuritiesMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_FixedIncomeSecuritiesMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_LongDurationFundsMember" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_CashAndCashEquivalentsMember" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_USTreasurySecuritiesMember" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_RegisteredInvestmentCompaniesMember" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_EquitySecuritiesMember" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_RealEstateMember" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_DebtSecuritiesMember" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward" xlink:to="us-gaap_DefinedBenefitPlanBenefitObligation" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward" xlink:to="us-gaap_DefinedBenefitPlanServiceCost" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward" xlink:to="us-gaap_DefinedBenefitPlanInterestCost" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward" xlink:to="us-gaap_DefinedBenefitPlanActuarialNetGainsLosses" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward" xlink:to="us-gaap_DefinedBenefitPlanBenefitsPaid" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward" xlink:to="us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward" xlink:to="etn_DefinedBenefitPlanOther" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward" xlink:to="us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward" xlink:to="us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward" xlink:to="us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward" xlink:to="us-gaap_DefinedBenefitPlanContributionsByEmployer" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward" xlink:to="us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesPlanAssets" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward" xlink:to="etn_DefinedBenefitPlanOtherAssets" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract" xlink:to="us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract" xlink:to="us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract" xlink:to="us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract" xlink:to="us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract" xlink:to="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract" xlink:to="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract" xlink:to="etn_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeForeignCurrencyTranslation" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract" xlink:to="etn_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeIncludedInExpenses" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract" xlink:to="etn_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeOther" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecreaseAbstract" xlink:to="us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPeriodIncreaseDecrease" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract" xlink:to="us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract" xlink:to="us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract" xlink:to="etn_TotalBenefitPlans" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract" xlink:to="us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract" xlink:to="us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract" xlink:to="us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanAmountsThatWillBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossInNextFiscalYearAbstract" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanAmountsThatWillBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossInNextFiscalYearAbstract" xlink:to="us-gaap_DefinedBenefitPlanAmortizationOfNetGainsLosses" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanAmountsThatWillBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossInNextFiscalYearAbstract" xlink:to="us-gaap_DefinedBenefitPlanAmortizationOfNetPriorServiceCostCredit" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanAmountsThatWillBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossInNextFiscalYearAbstract" xlink:to="us-gaap_DefinedBenefitPlanAmountsThatWillBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossInNextFiscalYear" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanAssumptionsUsedInCalculationsAbstract" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanAssumptionsUsedInCalculationsAbstract" xlink:to="etn_DefinedBenefitPlansWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlansWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract" xlink:to="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlansWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract" xlink:to="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanAssumptionsUsedInCalculationsAbstract" xlink:to="etn_DefinedBenefitPlansWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlansWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract" xlink:to="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlansWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract" xlink:to="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlansWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract" xlink:to="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease" order="3" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/RetirementBenefitPlansDetails1" xlink:title="06061 - Disclosure - Retirement Benefit Plans (Details 1)">
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlansByInvesteeAxis" xlink:label="etn_DefinedBenefitPlansByInvesteeAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlansByInvesteeDomain" xlink:label="etn_DefinedBenefitPlansByInvesteeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="etn_DefinedBenefitPlansByInvesteeAxis" xlink:to="etn_DefinedBenefitPlansByInvesteeDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/RetirementBenefitPlansDetails1" xlink:title="06061 - Disclosure - Retirement Benefit Plans (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="us-gaap_DefinedBenefitPlansDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:to="us-gaap_DefinedBenefitPlansDomain" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/RetirementBenefitPlansDetails1" xlink:title="06061 - Disclosure - Retirement Benefit Plans (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" xlink:label="us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValuePlanAssetMeasurementDomain" xlink:label="us-gaap_FairValuePlanAssetMeasurementDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" xlink:to="us-gaap_FairValuePlanAssetMeasurementDomain" order="3" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/RetirementBenefitPlansDetails1" xlink:title="06061 - Disclosure - Retirement Benefit Plans (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:label="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="us-gaap_PlanAssetCategoriesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:to="us-gaap_PlanAssetCategoriesDomain" order="4" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/RetirementBenefitPlansDetails2" xlink:title="06062 - Disclosure - Retirement Benefit Plans (Details 2)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlansByInvesteeAxis" xlink:label="etn_DefinedBenefitPlansByInvesteeAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlansByInvesteeDomain" xlink:label="etn_DefinedBenefitPlansByInvesteeDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_CommonCollectiveTrustsMember" xlink:label="etn_CommonCollectiveTrustsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="us-gaap_DefinedBenefitPlansDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="us-gaap_PensionPlansDefinedBenefitMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember" xlink:label="us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ForeignPensionPlansDefinedBenefitMember" xlink:label="us-gaap_ForeignPensionPlansDefinedBenefitMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_UKPensionPlanMember" xlink:label="etn_UKPensionPlanMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" xlink:label="us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValuePlanAssetMeasurementDomain" xlink:label="us-gaap_FairValuePlanAssetMeasurementDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="us-gaap_FairValueInputsLevel1Member" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="us-gaap_FairValueInputsLevel2Member" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="us-gaap_FairValueInputsLevel3Member" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:label="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="us-gaap_PlanAssetCategoriesDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OtherPlanAssetMember" xlink:label="etn_OtherPlanAssetMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OtherFixedIncomeMember" xlink:label="etn_OtherFixedIncomeMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DomesticSecuritiesMember" xlink:label="etn_DomesticSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ForeignEquitySecuritiesMember" xlink:label="etn_ForeignEquitySecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FixedIncomeSecuritiesMember" xlink:label="us-gaap_FixedIncomeSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_LongDurationFundsMember" xlink:label="etn_LongDurationFundsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CashAndCashEquivalentsMember" xlink:label="us-gaap_CashAndCashEquivalentsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_USTreasurySecuritiesMember" xlink:label="us-gaap_USTreasurySecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_RegisteredInvestmentCompaniesMember" xlink:label="etn_RegisteredInvestmentCompaniesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="us-gaap_EquitySecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RealEstateMember" xlink:label="us-gaap_RealEstateMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DebtSecuritiesMember" xlink:label="us-gaap_DebtSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="us-gaap_DefinedBenefitPlanDisclosureLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract" xlink:label="us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear" xlink:label="us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate" xlink:label="us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanYearThatRateReachesUltimateTrendRate" xlink:label="us-gaap_DefinedBenefitPlanYearThatRateReachesUltimateTrendRate" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract" xlink:label="us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate" xlink:label="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_AssumptionsUsedToDetermineExpenseInitialHealthCareCostTrendRate" xlink:label="etn_AssumptionsUsedToDetermineExpenseInitialHealthCareCostTrendRate" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlanUltimateHealthCareCostTrendRateAssumptionsUsedToDetermineExpense" xlink:label="etn_DefinedBenefitPlanUltimateHealthCareCostTrendRateAssumptionsUsedToDetermineExpense" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlanYearThatRateReachesUltimateTrendRateAssumptionsUsedToDetermineExpense" xlink:label="etn_DefinedBenefitPlanYearThatRateReachesUltimateTrendRateAssumptionsUsedToDetermineExpense" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesAbstract" xlink:label="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents" xlink:label="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents" xlink:label="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation" xlink:label="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation" xlink:label="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlanContributionsByEmployerDisclosureAbstract" xlink:label="etn_DefinedBenefitPlanContributionsByEmployerDisclosureAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer" xlink:label="us-gaap_DefinedBenefitPlanContributionsByEmployer" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlanExpectedOtherPostretirementBenefitPaymentsAndExpectedSubsidyAbstract" xlink:label="etn_DefinedBenefitPlanExpectedOtherPostretirementBenefitPaymentsAndExpectedSubsidyAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearOne" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearOne" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearTwo" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearTwo" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearThree" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearThree" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearFour" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearFour" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearFive" xlink:label="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearFive" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlanExpectedFutureBenefitPaymentsFromYearSixTillYearTen" xlink:label="etn_DefinedBenefitPlanExpectedFutureBenefitPaymentsFromYearSixTillYearTen" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PrescriptionDrugSubsidyReceiptsYearOne" xlink:label="us-gaap_PrescriptionDrugSubsidyReceiptsYearOne" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PrescriptionDrugSubsidyReceiptsYearTwo" xlink:label="us-gaap_PrescriptionDrugSubsidyReceiptsYearTwo" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PrescriptionDrugSubsidyReceiptsYearThree" xlink:label="us-gaap_PrescriptionDrugSubsidyReceiptsYearThree" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PrescriptionDrugSubsidyReceiptsYearFour" xlink:label="us-gaap_PrescriptionDrugSubsidyReceiptsYearFour" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PrescriptionDrugSubsidyReceiptsYearFive" xlink:label="us-gaap_PrescriptionDrugSubsidyReceiptsYearFive" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_PrescriptionDrugSubsidyReceiptsFromYearSixTillYearTen" xlink:label="etn_PrescriptionDrugSubsidyReceiptsFromYearSixTillYearTen" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanSettlementsBenefitObligation" xlink:label="us-gaap_DefinedBenefitPlanSettlementsBenefitObligation" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanCurtailments" xlink:label="us-gaap_DefinedBenefitPlanCurtailments" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements" xlink:label="us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations" xlink:label="us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecurities" xlink:label="us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecurities" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecurities" xlink:label="us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecurities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:to="etn_DefinedBenefitPlansByInvesteeAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="etn_DefinedBenefitPlansByInvesteeAxis" xlink:to="etn_DefinedBenefitPlansByInvesteeDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlansByInvesteeDomain" xlink:to="etn_CommonCollectiveTrustsMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:to="us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:to="us-gaap_DefinedBenefitPlansDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="us-gaap_PensionPlansDefinedBenefitMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="us-gaap_ForeignPensionPlansDefinedBenefitMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlansDomain" xlink:to="etn_UKPensionPlanMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:to="us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" xlink:to="us-gaap_FairValuePlanAssetMeasurementDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValuePlanAssetMeasurementDomain" xlink:to="us-gaap_FairValueInputsLevel1Member" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValuePlanAssetMeasurementDomain" xlink:to="us-gaap_FairValueInputsLevel2Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValuePlanAssetMeasurementDomain" xlink:to="us-gaap_FairValueInputsLevel3Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:to="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:to="us-gaap_PlanAssetCategoriesDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_OtherPlanAssetMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_OtherFixedIncomeMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_DomesticSecuritiesMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_ForeignEquitySecuritiesMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_FixedIncomeSecuritiesMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_LongDurationFundsMember" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_CashAndCashEquivalentsMember" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_USTreasurySecuritiesMember" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="etn_RegisteredInvestmentCompaniesMember" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_EquitySecuritiesMember" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_RealEstateMember" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PlanAssetCategoriesDomain" xlink:to="us-gaap_DebtSecuritiesMember" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract" xlink:to="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract" xlink:to="us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract" xlink:to="us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract" xlink:to="us-gaap_DefinedBenefitPlanYearThatRateReachesUltimateTrendRate" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract" xlink:to="us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract" xlink:to="etn_AssumptionsUsedToDetermineExpenseInitialHealthCareCostTrendRate" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract" xlink:to="etn_DefinedBenefitPlanUltimateHealthCareCostTrendRateAssumptionsUsedToDetermineExpense" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract" xlink:to="etn_DefinedBenefitPlanYearThatRateReachesUltimateTrendRateAssumptionsUsedToDetermineExpense" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesAbstract" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesAbstract" xlink:to="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesAbstract" xlink:to="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesAbstract" xlink:to="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointChangeInAssumedHealthCareCostTrendRatesAbstract" xlink:to="us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="etn_DefinedBenefitPlanContributionsByEmployerDisclosureAbstract" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlanContributionsByEmployerDisclosureAbstract" xlink:to="us-gaap_DefinedBenefitPlanContributionsByEmployer" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="etn_DefinedBenefitPlanExpectedOtherPostretirementBenefitPaymentsAndExpectedSubsidyAbstract" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlanExpectedOtherPostretirementBenefitPaymentsAndExpectedSubsidyAbstract" xlink:to="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearOne" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlanExpectedOtherPostretirementBenefitPaymentsAndExpectedSubsidyAbstract" xlink:to="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearTwo" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlanExpectedOtherPostretirementBenefitPaymentsAndExpectedSubsidyAbstract" xlink:to="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearThree" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlanExpectedOtherPostretirementBenefitPaymentsAndExpectedSubsidyAbstract" xlink:to="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearFour" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlanExpectedOtherPostretirementBenefitPaymentsAndExpectedSubsidyAbstract" xlink:to="us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearFive" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlanExpectedOtherPostretirementBenefitPaymentsAndExpectedSubsidyAbstract" xlink:to="etn_DefinedBenefitPlanExpectedFutureBenefitPaymentsFromYearSixTillYearTen" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlanExpectedOtherPostretirementBenefitPaymentsAndExpectedSubsidyAbstract" xlink:to="us-gaap_PrescriptionDrugSubsidyReceiptsYearOne" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlanExpectedOtherPostretirementBenefitPaymentsAndExpectedSubsidyAbstract" xlink:to="us-gaap_PrescriptionDrugSubsidyReceiptsYearTwo" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlanExpectedOtherPostretirementBenefitPaymentsAndExpectedSubsidyAbstract" xlink:to="us-gaap_PrescriptionDrugSubsidyReceiptsYearThree" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlanExpectedOtherPostretirementBenefitPaymentsAndExpectedSubsidyAbstract" xlink:to="us-gaap_PrescriptionDrugSubsidyReceiptsYearFour" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlanExpectedOtherPostretirementBenefitPaymentsAndExpectedSubsidyAbstract" xlink:to="us-gaap_PrescriptionDrugSubsidyReceiptsYearFive" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DefinedBenefitPlanExpectedOtherPostretirementBenefitPaymentsAndExpectedSubsidyAbstract" xlink:to="etn_PrescriptionDrugSubsidyReceiptsFromYearSixTillYearTen" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanSettlementsBenefitObligation" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanCurtailments" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecurities" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:to="us-gaap_DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecurities" order="11" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/RetirementBenefitPlansDetails2" xlink:title="06062 - Disclosure - Retirement Benefit Plans (Details 2)">
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlansByInvesteeAxis" xlink:label="etn_DefinedBenefitPlansByInvesteeAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DefinedBenefitPlansByInvesteeDomain" xlink:label="etn_DefinedBenefitPlansByInvesteeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="etn_DefinedBenefitPlansByInvesteeAxis" xlink:to="etn_DefinedBenefitPlansByInvesteeDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/RetirementBenefitPlansDetails2" xlink:title="06062 - Disclosure - Retirement Benefit Plans (Details 2)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="us-gaap_DefinedBenefitPlansDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:to="us-gaap_DefinedBenefitPlansDomain" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/RetirementBenefitPlansDetails2" xlink:title="06062 - Disclosure - Retirement Benefit Plans (Details 2)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" xlink:label="us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValuePlanAssetMeasurementDomain" xlink:label="us-gaap_FairValuePlanAssetMeasurementDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsByMeasurementAxis" xlink:to="us-gaap_FairValuePlanAssetMeasurementDomain" order="3" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/RetirementBenefitPlansDetails2" xlink:title="06062 - Disclosure - Retirement Benefit Plans (Details 2)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:label="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="us-gaap_PlanAssetCategoriesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:to="us-gaap_PlanAssetCategoriesDomain" order="4" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/IncomeTaxesDetails" xlink:title="0608 - Disclosure - Income Taxes (Details)">
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardTable" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardTable" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardAxis" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCredtCarryForwardDomain" xlink:label="etn_OperatingLossAndTaxCredtCarryForwardDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_UnitedStatesMember" xlink:label="etn_UnitedStatesMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ExpirationDate2011Through2015Member" xlink:label="etn_ExpirationDate2011Through2015Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ExpirationDate2016Through2020Member" xlink:label="etn_ExpirationDate2016Through2020Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ExpirationDate2021Through2025Member" xlink:label="etn_ExpirationDate2021Through2025Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ExpirationDate2026Through2030Member" xlink:label="etn_ExpirationDate2026Through2030Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_NotSubjectToExpirationMember" xlink:label="etn_NotSubjectToExpirationMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_RelatedValuationAllowanceMember" xlink:label="etn_RelatedValuationAllowanceMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardLineItems" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardLineItems" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditCarryforwardsDomesticAbstract" xlink:label="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditCarryforwardsDomesticAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OperatingLossCarryforwards" xlink:label="us-gaap_OperatingLossCarryforwards" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OperatingLossCarryforwardsValuationAllowance" xlink:label="us-gaap_OperatingLossCarryforwardsValuationAllowance" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_TaxCreditCarryforwardAmount" xlink:label="us-gaap_TaxCreditCarryforwardAmount" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_TaxCreditCarryforwardValuationAllowance" xlink:label="us-gaap_TaxCreditCarryforwardValuationAllowance" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherTaxCarryforwardValuationAllowance" xlink:label="us-gaap_OtherTaxCarryforwardValuationAllowance" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardTable" xlink:to="etn_OperatingLossAndTaxCreditCarryForwardAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardAxis" xlink:to="etn_OperatingLossAndTaxCredtCarryForwardDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCredtCarryForwardDomain" xlink:to="etn_UnitedStatesMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardTable" xlink:to="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" xlink:to="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_ExpirationDate2011Through2015Member" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_ExpirationDate2016Through2020Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_ExpirationDate2021Through2025Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_ExpirationDate2026Through2030Member" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_NotSubjectToExpirationMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_RelatedValuationAllowanceMember" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardLineItems" xlink:to="etn_OperatingLossAndTaxCreditCarryForwardTable" order="3" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardLineItems" xlink:to="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditCarryforwardsDomesticAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditCarryforwardsDomesticAbstract" xlink:to="us-gaap_OperatingLossCarryforwards" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditCarryforwardsDomesticAbstract" xlink:to="us-gaap_OperatingLossCarryforwardsValuationAllowance" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditCarryforwardsDomesticAbstract" xlink:to="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditCarryforwardsDomesticAbstract" xlink:to="us-gaap_TaxCreditCarryforwardAmount" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditCarryforwardsDomesticAbstract" xlink:to="us-gaap_TaxCreditCarryforwardValuationAllowance" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditCarryforwardsDomesticAbstract" xlink:to="us-gaap_OtherTaxCarryforwardValuationAllowance" order="6" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/IncomeTaxesDetails" xlink:title="0608 - Disclosure - Income Taxes (Details)">
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardAxis" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCredtCarryForwardDomain" xlink:label="etn_OperatingLossAndTaxCredtCarryForwardDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardAxis" xlink:to="etn_OperatingLossAndTaxCredtCarryForwardDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/IncomeTaxesDetails" xlink:title="0608 - Disclosure - Income Taxes (Details)">
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" xlink:to="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/IncomeTaxesDetails1" xlink:title="06081 - Disclosure - Income Taxes (Details 1)">
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardTable" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardTable" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardAxis" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCredtCarryForwardDomain" xlink:label="etn_OperatingLossAndTaxCredtCarryForwardDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_StateAndLocalMember" xlink:label="etn_StateAndLocalMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ExpirationDate2011Through2015Member" xlink:label="etn_ExpirationDate2011Through2015Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ExpirationDate2016Through2020Member" xlink:label="etn_ExpirationDate2016Through2020Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ExpirationDate2021Through2025Member" xlink:label="etn_ExpirationDate2021Through2025Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ExpirationDate2026Through2030Member" xlink:label="etn_ExpirationDate2026Through2030Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_NotSubjectToExpirationMember" xlink:label="etn_NotSubjectToExpirationMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_RelatedValuationAllowanceMember" xlink:label="etn_RelatedValuationAllowanceMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardLineItems" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardLineItems" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditCarryforwardsStateAndLocalAbstract" xlink:label="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditCarryforwardsStateAndLocalAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OperatingLossCarryforwards" xlink:label="us-gaap_OperatingLossCarryforwards" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OperatingLossCarryforwardsValuationAllowance" xlink:label="us-gaap_OperatingLossCarryforwardsValuationAllowance" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_TaxCreditCarryforwardAmount" xlink:label="us-gaap_TaxCreditCarryforwardAmount" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_TaxCreditCarryforwardValuationAllowance" xlink:label="us-gaap_TaxCreditCarryforwardValuationAllowance" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardTable" xlink:to="etn_OperatingLossAndTaxCreditCarryForwardAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardAxis" xlink:to="etn_OperatingLossAndTaxCredtCarryForwardDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCredtCarryForwardDomain" xlink:to="etn_StateAndLocalMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardTable" xlink:to="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" xlink:to="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_ExpirationDate2011Through2015Member" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_ExpirationDate2016Through2020Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_ExpirationDate2021Through2025Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_ExpirationDate2026Through2030Member" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_NotSubjectToExpirationMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_RelatedValuationAllowanceMember" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardLineItems" xlink:to="etn_OperatingLossAndTaxCreditCarryForwardTable" order="3" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardLineItems" xlink:to="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditCarryforwardsStateAndLocalAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditCarryforwardsStateAndLocalAbstract" xlink:to="us-gaap_OperatingLossCarryforwards" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditCarryforwardsStateAndLocalAbstract" xlink:to="us-gaap_OperatingLossCarryforwardsValuationAllowance" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditCarryforwardsStateAndLocalAbstract" xlink:to="us-gaap_TaxCreditCarryforwardAmount" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditCarryforwardsStateAndLocalAbstract" xlink:to="us-gaap_TaxCreditCarryforwardValuationAllowance" order="4" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/IncomeTaxesDetails1" xlink:title="06081 - Disclosure - Income Taxes (Details 1)">
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardAxis" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCredtCarryForwardDomain" xlink:label="etn_OperatingLossAndTaxCredtCarryForwardDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardAxis" xlink:to="etn_OperatingLossAndTaxCredtCarryForwardDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/IncomeTaxesDetails1" xlink:title="06081 - Disclosure - Income Taxes (Details 1)">
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" xlink:to="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/IncomeTaxesDetails2" xlink:title="06082 - Disclosure - Income Taxes (Details 2)">
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardTable" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardTable" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardAxis" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCredtCarryForwardDomain" xlink:label="etn_OperatingLossAndTaxCredtCarryForwardDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_UnitedStatesMember" xlink:label="etn_UnitedStatesMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ForeignCountriesMember" xlink:label="etn_ForeignCountriesMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_StateAndLocalMember" xlink:label="etn_StateAndLocalMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_WorldwideMember" xlink:label="etn_WorldwideMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ExpirationDate2011Through2015Member" xlink:label="etn_ExpirationDate2011Through2015Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ExpirationDate2016Through2020Member" xlink:label="etn_ExpirationDate2016Through2020Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ExpirationDate2021Through2025Member" xlink:label="etn_ExpirationDate2021Through2025Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ExpirationDate2026Through2030Member" xlink:label="etn_ExpirationDate2026Through2030Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_NotSubjectToExpirationMember" xlink:label="etn_NotSubjectToExpirationMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_RelatedValuationAllowanceMember" xlink:label="etn_RelatedValuationAllowanceMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardLineItems" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardLineItems" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditAbstractCarryforwardsForeignAbstract" xlink:label="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditAbstractCarryforwardsForeignAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OperatingLossCarryforwards" xlink:label="us-gaap_OperatingLossCarryforwards" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OperatingLossCarryforwardsValuationAllowance" xlink:label="us-gaap_OperatingLossCarryforwardsValuationAllowance" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_TaxCreditCarryforwardAmount" xlink:label="us-gaap_TaxCreditCarryforwardAmount" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_TaxCreditCarryforwardValuationAllowance" xlink:label="us-gaap_TaxCreditCarryforwardValuationAllowance" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherTaxCarryforwardValuationAllowance" xlink:label="us-gaap_OtherTaxCarryforwardValuationAllowance" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ValuationAllowanceAmount" xlink:label="us-gaap_ValuationAllowanceAmount" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="us-gaap_IncomeTaxExpenseBenefit" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardTable" xlink:to="etn_OperatingLossAndTaxCreditCarryForwardAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardAxis" xlink:to="etn_OperatingLossAndTaxCredtCarryForwardDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCredtCarryForwardDomain" xlink:to="etn_UnitedStatesMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCredtCarryForwardDomain" xlink:to="etn_ForeignCountriesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCredtCarryForwardDomain" xlink:to="etn_StateAndLocalMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCredtCarryForwardDomain" xlink:to="etn_WorldwideMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardTable" xlink:to="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" xlink:to="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_ExpirationDate2011Through2015Member" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_ExpirationDate2016Through2020Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_ExpirationDate2021Through2025Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_ExpirationDate2026Through2030Member" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_NotSubjectToExpirationMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:to="etn_RelatedValuationAllowanceMember" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardLineItems" xlink:to="etn_OperatingLossAndTaxCreditCarryForwardTable" order="3" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardLineItems" xlink:to="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditAbstractCarryforwardsForeignAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditAbstractCarryforwardsForeignAbstract" xlink:to="us-gaap_OperatingLossCarryforwards" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditAbstractCarryforwardsForeignAbstract" xlink:to="us-gaap_OperatingLossCarryforwardsValuationAllowance" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditAbstractCarryforwardsForeignAbstract" xlink:to="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditAbstractCarryforwardsForeignAbstract" xlink:to="us-gaap_TaxCreditCarryforwardAmount" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditAbstractCarryforwardsForeignAbstract" xlink:to="us-gaap_TaxCreditCarryforwardValuationAllowance" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsIncomeTaxLossCarryforwardsAndIncomeTaxCreditAbstractCarryforwardsForeignAbstract" xlink:to="us-gaap_OtherTaxCarryforwardValuationAllowance" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardLineItems" xlink:to="us-gaap_ValuationAllowanceAmount" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardLineItems" xlink:to="us-gaap_IncomeTaxExpenseBenefit" order="3" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/IncomeTaxesDetails2" xlink:title="06082 - Disclosure - Income Taxes (Details 2)">
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardAxis" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCredtCarryForwardDomain" xlink:label="etn_OperatingLossAndTaxCredtCarryForwardDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardAxis" xlink:to="etn_OperatingLossAndTaxCredtCarryForwardDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/IncomeTaxesDetails2" xlink:title="06082 - Disclosure - Income Taxes (Details 2)">
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" xlink:label="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesAxis" xlink:to="etn_OperatingLossAndTaxCreditCarryForwardByExpirationDatesDomain" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/IncomeTaxesDetails3" xlink:title="06083 - Disclosure - Income Taxes (Details 3)">
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DeferredTaxAssetsAndLiabilitiesTable" xlink:label="etn_DeferredTaxAssetsAndLiabilitiesTable" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DeferredTaxAssetsAndLiabilitiesAxis" xlink:label="etn_DeferredTaxAssetsAndLiabilitiesAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DeferredTaxAssetsAndLiabilitiesDomain" xlink:label="etn_DeferredTaxAssetsAndLiabilitiesDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_CurrentAssetsMember" xlink:label="etn_CurrentAssetsMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_LongTermAssetsAndLiabilitiesMember" xlink:label="etn_LongTermAssetsAndLiabilitiesMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DeferredTaxAssetsAndLiabilitiesLineItems" xlink:label="etn_DeferredTaxAssetsAndLiabilitiesLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNetAbstract" xlink:label="us-gaap_DeferredTaxAssetsLiabilitiesNetAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAbstract" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment" xlink:label="us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredTaxAssetsOther" xlink:label="us-gaap_DeferredTaxAssetsOther" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredTaxLiabilitiesOther" xlink:label="us-gaap_DeferredTaxLiabilitiesOther" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DeferredTaxAssetsTaxCreditCarryforwardsDomestic" xlink:label="etn_DeferredTaxAssetsTaxCreditCarryforwardsDomestic" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DeferredTaxAssetsStateAndLocalTaxLossCarryforwardsAndTaxCreditCarryforwards" xlink:label="etn_DeferredTaxAssetsStateAndLocalTaxLossCarryforwardsAndTaxCreditCarryforwards" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign" xlink:label="us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ValuationAllowanceForIncomeTaxLossAndIncomeTaxCreditCarryforwards" xlink:label="etn_ValuationAllowanceForIncomeTaxLossAndIncomeTaxCreditCarryforwards" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DeferredTaxAssetValuationAllowanceOther" xlink:label="etn_DeferredTaxAssetValuationAllowanceOther" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet" xlink:label="us-gaap_DeferredTaxAssetsLiabilitiesNet" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="etn_DeferredTaxAssetsAndLiabilitiesTable" xlink:to="etn_DeferredTaxAssetsAndLiabilitiesAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="etn_DeferredTaxAssetsAndLiabilitiesAxis" xlink:to="etn_DeferredTaxAssetsAndLiabilitiesDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsAndLiabilitiesDomain" xlink:to="etn_CurrentAssetsMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsAndLiabilitiesDomain" xlink:to="etn_LongTermAssetsAndLiabilitiesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="etn_DeferredTaxAssetsAndLiabilitiesLineItems" xlink:to="etn_DeferredTaxAssetsAndLiabilitiesTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DeferredTaxAssetsAndLiabilitiesLineItems" xlink:to="us-gaap_DeferredTaxAssetsLiabilitiesNetAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DeferredTaxAssetsLiabilitiesNetAbstract" xlink:to="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAbstract" xlink:to="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAbstract" xlink:to="us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAbstract" xlink:to="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DeferredTaxAssetsLiabilitiesNetAbstract" xlink:to="us-gaap_DeferredTaxAssetsOther" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DeferredTaxAssetsLiabilitiesNetAbstract" xlink:to="us-gaap_DeferredTaxLiabilitiesOther" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DeferredTaxAssetsLiabilitiesNetAbstract" xlink:to="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DeferredTaxAssetsLiabilitiesNetAbstract" xlink:to="etn_DeferredTaxAssetsTaxCreditCarryforwardsDomestic" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DeferredTaxAssetsLiabilitiesNetAbstract" xlink:to="etn_DeferredTaxAssetsStateAndLocalTaxLossCarryforwardsAndTaxCreditCarryforwards" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DeferredTaxAssetsLiabilitiesNetAbstract" xlink:to="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DeferredTaxAssetsLiabilitiesNetAbstract" xlink:to="us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DeferredTaxAssetsLiabilitiesNetAbstract" xlink:to="etn_ValuationAllowanceForIncomeTaxLossAndIncomeTaxCreditCarryforwards" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DeferredTaxAssetsLiabilitiesNetAbstract" xlink:to="etn_DeferredTaxAssetValuationAllowanceOther" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DeferredTaxAssetsLiabilitiesNetAbstract" xlink:to="us-gaap_DeferredTaxAssetsLiabilitiesNet" order="11" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/IncomeTaxesDetails3" xlink:title="06083 - Disclosure - Income Taxes (Details 3)">
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DeferredTaxAssetsAndLiabilitiesAxis" xlink:label="etn_DeferredTaxAssetsAndLiabilitiesAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DeferredTaxAssetsAndLiabilitiesDomain" xlink:label="etn_DeferredTaxAssetsAndLiabilitiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="etn_DeferredTaxAssetsAndLiabilitiesAxis" xlink:to="etn_DeferredTaxAssetsAndLiabilitiesDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/StockOptionsAndRestrictedUnitsDetails" xlink:title="0610 - Disclosure - Stock Options and Restricted Units (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_RangeAxis" xlink:label="etn_RangeAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_RangeDomain" xlink:label="etn_RangeDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_MinimumMember" xlink:label="etn_MinimumMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_MaximumMember" xlink:label="etn_MaximumMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="us-gaap_EmployeeStockOptionMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="us-gaap_RestrictedStockMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod" xlink:label="etn_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="etn_RangeAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="etn_RangeAxis" xlink:to="etn_RangeDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_RangeDomain" xlink:to="etn_MinimumMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_RangeDomain" xlink:to="etn_MaximumMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_EmployeeStockOptionMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_RestrictedStockMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" order="3" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="etn_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod" order="5" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/StockOptionsAndRestrictedUnitsDetails" xlink:title="0610 - Disclosure - Stock Options and Restricted Units (Details)">
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_RangeAxis" xlink:label="etn_RangeAxis" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_RangeDomain" xlink:label="etn_RangeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="etn_RangeAxis" xlink:to="etn_RangeDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/StockOptionsAndRestrictedUnitsDetails" xlink:title="0610 - Disclosure - Stock Options and Restricted Units (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAndPlanNameAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/FairValueMeasurementsDetails" xlink:title="0611 - Disclosure - Fair Value Measurements (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisTable" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="us-gaap_FairValueInputsLevel1Member" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="us-gaap_FairValueInputsLevel2Member" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="us-gaap_FairValueInputsLevel3Member" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisFinancialStatementCaptionsLineItems" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisFinancialStatementCaptionsLineItems" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SummaryOfFinancialInstrumentsRecognizedAtFairValueAndFairValueMeasurementUsedAbstract" xlink:label="etn_SummaryOfFinancialInstrumentsRecognizedAtFairValueAndFairValueMeasurementUsedAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_Cash" xlink:label="us-gaap_Cash" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AvailableForSaleSecuritiesCurrent" xlink:label="us-gaap_AvailableForSaleSecuritiesCurrent" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeNet" xlink:label="us-gaap_DerivativeFairValueOfDerivativeNet" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_RelatedLongTermDebtConvertedToFloatingInterestRatesByInterestRateSwaps" xlink:label="etn_RelatedLongTermDebtConvertedToFloatingInterestRatesByInterestRateSwaps" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTable" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" xlink:to="us-gaap_FairValueInputsLevel1Member" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" xlink:to="us-gaap_FairValueInputsLevel2Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" xlink:to="us-gaap_FairValueInputsLevel3Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisFinancialStatementCaptionsLineItems" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisFinancialStatementCaptionsLineItems" xlink:to="etn_SummaryOfFinancialInstrumentsRecognizedAtFairValueAndFairValueMeasurementUsedAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_SummaryOfFinancialInstrumentsRecognizedAtFairValueAndFairValueMeasurementUsedAbstract" xlink:to="us-gaap_Cash" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_SummaryOfFinancialInstrumentsRecognizedAtFairValueAndFairValueMeasurementUsedAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesCurrent" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_SummaryOfFinancialInstrumentsRecognizedAtFairValueAndFairValueMeasurementUsedAbstract" xlink:to="us-gaap_DerivativeFairValueOfDerivativeNet" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_SummaryOfFinancialInstrumentsRecognizedAtFairValueAndFairValueMeasurementUsedAbstract" xlink:to="etn_RelatedLongTermDebtConvertedToFloatingInterestRatesByInterestRateSwaps" order="4" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/FairValueMeasurementsDetails" xlink:title="0611 - Disclosure - Fair Value Measurements (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/FairValueMeasurementsDetails1" xlink:title="06111 - Disclosure - Fair Value Measurements (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_TimeDepositsAndCertificateOfDepositsWithBanksMember" xlink:label="etn_TimeDepositsAndCertificateOfDepositsWithBanksMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MoneyMarketFundsMember" xlink:label="us-gaap_MoneyMarketFundsMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OtherSecuritiesMember" xlink:label="etn_OtherSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AvailableForSaleSecuritiesCurrentAbstract" xlink:label="us-gaap_AvailableForSaleSecuritiesCurrentAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AvailableForSaleSecuritiesCurrent" xlink:label="us-gaap_AvailableForSaleSecuritiesCurrent" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:to="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:to="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="etn_TimeDepositsAndCertificateOfDepositsWithBanksMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="us-gaap_MoneyMarketFundsMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="etn_OtherSecuritiesMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:to="us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:to="us-gaap_AvailableForSaleSecuritiesCurrentAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AvailableForSaleSecuritiesCurrentAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesCurrent" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/FairValueMeasurementsDetails1" xlink:title="06111 - Disclosure - Fair Value Measurements (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:to="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/DerivativeInstrumentsAndHedgingActivitiesDetails" xlink:title="0612 - Disclosure - Derivative Financial Instruments and Hedging Activities (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="us-gaap_DebtInstrumentTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="us-gaap_LongtermDebtTypeAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note4Point9PercentageDue2013Member" xlink:label="etn_Note4Point9PercentageDue2013Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note5Point95PercentageDue2014Member" xlink:label="etn_Note5Point95PercentageDue2014Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Note5Point6PercentageDue2018Member" xlink:label="etn_Note5Point6PercentageDue2018Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Debentures8Point875PercentageDue2019Member" xlink:label="etn_Debentures8Point875PercentageDue2019Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Debentures7Point625PercentageDue2024Member" xlink:label="etn_Debentures7Point625PercentageDue2024Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Debentures7Point65PercentageDue2029Member" xlink:label="etn_Debentures7Point65PercentageDue2029Member" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_Debentures5Point45PercentageDue2034Member" xlink:label="etn_Debentures5Point45PercentageDue2034Member" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="us-gaap_DebtInstrumentLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SummaryOfDerivativeInstrumentsAbstract" xlink:label="us-gaap_SummaryOfDerivativeInstrumentsAbstract" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DebtInstrumentConvertedFaceAmount" xlink:label="etn_DebtInstrumentConvertedFaceAmount" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeFixedInterestRate" xlink:label="us-gaap_DerivativeFixedInterestRate" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeVariableInterestRate" xlink:label="us-gaap_DerivativeVariableInterestRate" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeDescriptionOfVariableRateBasis" xlink:label="us-gaap_DerivativeDescriptionOfVariableRateBasis" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_LongtermDebtTypeAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_LongtermDebtTypeAxis" xlink:to="us-gaap_LongtermDebtTypeDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note4Point9PercentageDue2013Member" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note5Point95PercentageDue2014Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Note5Point6PercentageDue2018Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Debentures8Point875PercentageDue2019Member" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Debentures7Point625PercentageDue2024Member" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Debentures7Point65PercentageDue2029Member" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="etn_Debentures5Point45PercentageDue2034Member" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_SummaryOfDerivativeInstrumentsAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SummaryOfDerivativeInstrumentsAbstract" xlink:to="etn_DebtInstrumentConvertedFaceAmount" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SummaryOfDerivativeInstrumentsAbstract" xlink:to="us-gaap_DerivativeFixedInterestRate" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SummaryOfDerivativeInstrumentsAbstract" xlink:to="us-gaap_DerivativeVariableInterestRate" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SummaryOfDerivativeInstrumentsAbstract" xlink:to="us-gaap_DerivativeDescriptionOfVariableRateBasis" order="4" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/DerivativeInstrumentsAndHedgingActivitiesDetails" xlink:title="0612 - Disclosure - Derivative Financial Instruments and Hedging Activities (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="us-gaap_LongtermDebtTypeAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_LongtermDebtTypeAxis" xlink:to="us-gaap_LongtermDebtTypeDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/DerivativeInstrumentsAndHedgingActivitiesDetails1" xlink:title="06121 - Disclosure - Derivative Financial Instruments and Hedging Activities (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:label="us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis" xlink:label="us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="us-gaap_DerivativeContractTypeDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_InterestRateContractMember" xlink:label="us-gaap_InterestRateContractMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="us-gaap_ForeignExchangeContractMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommodityContractMember" xlink:label="us-gaap_CommodityContractMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CrossCurrencyInterestRateContractMember" xlink:label="us-gaap_CrossCurrencyInterestRateContractMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_RelatedLongTermDebtConvertedToFloatingInterestRatesByInterestRateSwapsMember" xlink:label="etn_RelatedLongTermDebtConvertedToFloatingInterestRatesByInterestRateSwapsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativesFairValueByBalanceSheetLocationAxis" xlink:label="us-gaap_DerivativesFairValueByBalanceSheetLocationAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="us-gaap_BalanceSheetLocationDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherAssetsMember" xlink:label="us-gaap_OtherAssetsMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OtherLongTermAssetsMember" xlink:label="etn_OtherLongTermAssetsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherLiabilitiesMember" xlink:label="us-gaap_OtherLiabilitiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="us-gaap_DerivativesFairValueLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeInstrumentsInStatementOfFinancialPositionFairValueAbstract" xlink:label="us-gaap_DerivativeInstrumentsInStatementOfFinancialPositionFairValueAbstract" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_DesignatedDerivativesAbstract" xlink:label="etn_DesignatedDerivativesAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NotionalAmountOfDerivativeInstrumentsDesignatedAsNetInvestmentHedges" xlink:label="us-gaap_NotionalAmountOfDerivativeInstrumentsDesignatedAsNetInvestmentHedges" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeAssetDesignatedAsHedgingInstrumentFairValue" xlink:label="us-gaap_DerivativeAssetDesignatedAsHedgingInstrumentFairValue" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeLiabilityDesignatedAsHedgingInstrumentFairValue" xlink:label="us-gaap_DerivativeLiabilityDesignatedAsHedgingInstrumentFairValue" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_NonDesignatedDerivativesAbstract" xlink:label="etn_NonDesignatedDerivativesAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NotionalAmountOfOtherDerivativesNotDesignatedAsHedgingInstruments" xlink:label="us-gaap_NotionalAmountOfOtherDerivativesNotDesignatedAsHedgingInstruments" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeAssetNotDesignatedAsHedgingInstrumentFairValue" xlink:label="us-gaap_DerivativeAssetNotDesignatedAsHedgingInstrumentFairValue" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeLiabilityNotDesignatedAsHedgingInstrumentFairValue" xlink:label="us-gaap_DerivativeLiabilityNotDesignatedAsHedgingInstrumentFairValue" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:to="us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis" xlink:to="us-gaap_DerivativeContractTypeDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DerivativeContractTypeDomain" xlink:to="us-gaap_InterestRateContractMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DerivativeContractTypeDomain" xlink:to="us-gaap_ForeignExchangeContractMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DerivativeContractTypeDomain" xlink:to="us-gaap_CommodityContractMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DerivativeContractTypeDomain" xlink:to="us-gaap_CrossCurrencyInterestRateContractMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DerivativeContractTypeDomain" xlink:to="etn_RelatedLongTermDebtConvertedToFloatingInterestRatesByInterestRateSwapsMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:to="us-gaap_DerivativesFairValueByBalanceSheetLocationAxis" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DerivativesFairValueByBalanceSheetLocationAxis" xlink:to="us-gaap_BalanceSheetLocationDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BalanceSheetLocationDomain" xlink:to="us-gaap_OtherAssetsMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BalanceSheetLocationDomain" xlink:to="etn_OtherLongTermAssetsMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BalanceSheetLocationDomain" xlink:to="us-gaap_OtherLiabilitiesMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_DerivativesFairValueLineItems" xlink:to="us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" order="3" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DerivativesFairValueLineItems" xlink:to="us-gaap_DerivativeInstrumentsInStatementOfFinancialPositionFairValueAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DerivativeInstrumentsInStatementOfFinancialPositionFairValueAbstract" xlink:to="etn_DesignatedDerivativesAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DesignatedDerivativesAbstract" xlink:to="us-gaap_NotionalAmountOfDerivativeInstrumentsDesignatedAsNetInvestmentHedges" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DesignatedDerivativesAbstract" xlink:to="us-gaap_DerivativeAssetDesignatedAsHedgingInstrumentFairValue" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_DesignatedDerivativesAbstract" xlink:to="us-gaap_DerivativeLiabilityDesignatedAsHedgingInstrumentFairValue" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DerivativeInstrumentsInStatementOfFinancialPositionFairValueAbstract" xlink:to="etn_NonDesignatedDerivativesAbstract" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_NonDesignatedDerivativesAbstract" xlink:to="us-gaap_NotionalAmountOfOtherDerivativesNotDesignatedAsHedgingInstruments" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_NonDesignatedDerivativesAbstract" xlink:to="us-gaap_DerivativeAssetNotDesignatedAsHedgingInstrumentFairValue" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_NonDesignatedDerivativesAbstract" xlink:to="us-gaap_DerivativeLiabilityNotDesignatedAsHedgingInstrumentFairValue" order="3" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/DerivativeInstrumentsAndHedgingActivitiesDetails1" xlink:title="06121 - Disclosure - Derivative Financial Instruments and Hedging Activities (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis" xlink:label="us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="us-gaap_DerivativeContractTypeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis" xlink:to="us-gaap_DerivativeContractTypeDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/DerivativeInstrumentsAndHedgingActivitiesDetails1" xlink:title="06121 - Disclosure - Derivative Financial Instruments and Hedging Activities (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativesFairValueByBalanceSheetLocationAxis" xlink:label="us-gaap_DerivativesFairValueByBalanceSheetLocationAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="us-gaap_BalanceSheetLocationDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DerivativesFairValueByBalanceSheetLocationAxis" xlink:to="us-gaap_BalanceSheetLocationDomain" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/DerivativeInstrumentsAndHedgingActivitiesDetails1" xlink:title="06121 - Disclosure - Derivative Financial Instruments and Hedging Activities (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" xlink:label="us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByDerivativeInstrumentRiskAxis" xlink:label="us-gaap_DerivativeInstrumentsGainLossByDerivativeInstrumentRiskAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="us-gaap_DerivativeContractTypeDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_InterestRateContractMember" xlink:label="us-gaap_InterestRateContractMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="us-gaap_ForeignExchangeContractMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommodityContractMember" xlink:label="us-gaap_CommodityContractMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CrossCurrencyInterestRateContractMember" xlink:label="us-gaap_CrossCurrencyInterestRateContractMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_RelatedLongTermDebtConvertedToFloatingInterestRatesByInterestRateSwapsMember" xlink:label="etn_RelatedLongTermDebtConvertedToFloatingInterestRatesByInterestRateSwapsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis" xlink:label="us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncomeStatementAndOtherComprehensiveIncomeLocationDomain" xlink:label="us-gaap_IncomeStatementAndOtherComprehensiveIncomeLocationDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CostOfSalesMember" xlink:label="us-gaap_CostOfSalesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_InterestExpenseMember" xlink:label="us-gaap_InterestExpenseMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis" xlink:label="us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="us-gaap_HedgingRelationshipDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueHedgingMember" xlink:label="us-gaap_FairValueHedgingMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CashFlowHedgingMember" xlink:label="us-gaap_CashFlowHedgingMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NetInvestmentHedgingMember" xlink:label="us-gaap_NetInvestmentHedgingMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems" xlink:label="us-gaap_DerivativeInstrumentsGainLossLineItems" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_AmountsRecognizedInAccumulatedOtherComprehensiveIncomeAbstract" xlink:label="etn_AmountsRecognizedInAccumulatedOtherComprehensiveIncomeAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings" xlink:label="us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths" xlink:label="us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_AmountsRecognizedInNetIncomeAbstract" xlink:label="etn_AmountsRecognizedInNetIncomeAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeNet" xlink:label="us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeNet" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" xlink:to="us-gaap_DerivativeInstrumentsGainLossByDerivativeInstrumentRiskAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DerivativeInstrumentsGainLossByDerivativeInstrumentRiskAxis" xlink:to="us-gaap_DerivativeContractTypeDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" xlink:to="us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis" xlink:to="us-gaap_IncomeStatementAndOtherComprehensiveIncomeLocationDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAndOtherComprehensiveIncomeLocationDomain" xlink:to="us-gaap_CostOfSalesMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAndOtherComprehensiveIncomeLocationDomain" xlink:to="us-gaap_InterestExpenseMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" xlink:to="us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis" xlink:to="us-gaap_HedgingRelationshipDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_HedgingRelationshipDomain" xlink:to="us-gaap_FairValueHedgingMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_HedgingRelationshipDomain" xlink:to="us-gaap_CashFlowHedgingMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_HedgingRelationshipDomain" xlink:to="us-gaap_NetInvestmentHedgingMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_DerivativeInstrumentsGainLossLineItems" xlink:to="us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" order="4" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DerivativeInstrumentsGainLossLineItems" xlink:to="etn_AmountsRecognizedInAccumulatedOtherComprehensiveIncomeAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_AmountsRecognizedInAccumulatedOtherComprehensiveIncomeAbstract" xlink:to="us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_AmountsRecognizedInAccumulatedOtherComprehensiveIncomeAbstract" xlink:to="us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DerivativeInstrumentsGainLossLineItems" xlink:to="etn_AmountsRecognizedInNetIncomeAbstract" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_AmountsRecognizedInNetIncomeAbstract" xlink:to="us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeNet" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/DerivativeInstrumentsAndHedgingActivitiesDetails1" xlink:title="06121 - Disclosure - Derivative Financial Instruments and Hedging Activities (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByDerivativeInstrumentRiskAxis" xlink:label="us-gaap_DerivativeInstrumentsGainLossByDerivativeInstrumentRiskAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="us-gaap_DerivativeContractTypeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DerivativeInstrumentsGainLossByDerivativeInstrumentRiskAxis" xlink:to="us-gaap_DerivativeContractTypeDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/DerivativeInstrumentsAndHedgingActivitiesDetails1" xlink:title="06121 - Disclosure - Derivative Financial Instruments and Hedging Activities (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis" xlink:label="us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncomeStatementAndOtherComprehensiveIncomeLocationDomain" xlink:label="us-gaap_IncomeStatementAndOtherComprehensiveIncomeLocationDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis" xlink:to="us-gaap_IncomeStatementAndOtherComprehensiveIncomeLocationDomain" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/DerivativeInstrumentsAndHedgingActivitiesDetails1" xlink:title="06121 - Disclosure - Derivative Financial Instruments and Hedging Activities (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis" xlink:label="us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="us-gaap_HedgingRelationshipDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis" xlink:to="us-gaap_HedgingRelationshipDomain" order="3" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/BusinessSegmentAndGeographicRegionInformationDetails1" xlink:title="0614 - Disclosure - Business Segment and Geographic Region Information (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="us-gaap_StatementBusinessSegmentsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentBusinessDomain" xlink:label="us-gaap_SegmentBusinessDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentFourMember" xlink:label="etn_SegmentFourMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentOneMember" xlink:label="etn_SegmentOneMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentTwoMember" xlink:label="etn_SegmentTwoMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentFiveMember" xlink:label="etn_SegmentFiveMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentSevenMember" xlink:label="etn_SegmentSevenMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentThreeMember" xlink:label="etn_SegmentThreeMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_TotalMember" xlink:label="etn_TotalMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentSixMember" xlink:label="etn_SegmentSixMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="us-gaap_SegmentReportingInformationLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:label="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SalesRevenueNet" xlink:label="us-gaap_SalesRevenueNet" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentReportingInformationOperatingIncomeLoss" xlink:label="us-gaap_SegmentReportingInformationOperatingIncomeLoss" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentReportingInformationAmortizationExpense" xlink:label="us-gaap_SegmentReportingInformationAmortizationExpense" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_InterestExpenseNet" xlink:label="etn_InterestExpenseNet" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_PensionAndOtherPostretirementBenefitsExpense" xlink:label="etn_PensionAndOtherPostretirementBenefitsExpense" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_StockOptionExpense" xlink:label="etn_StockOptionExpense" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_OtherCorporateExpenseNet" xlink:label="etn_OtherCorporateExpenseNet" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_IncomeLossFromContinuingOperationsBeforeIncomeTaxes" xlink:label="etn_IncomeLossFromContinuingOperationsBeforeIncomeTaxes" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="us-gaap_IncomeTaxExpenseBenefit" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" xlink:label="us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ProfitLoss" xlink:label="us-gaap_ProfitLoss" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="us-gaap_NetIncomeLoss" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_AcquisitionIntegrationChargesAbstract" xlink:label="etn_AcquisitionIntegrationChargesAbstract" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_AcquisitionIntegrationPretaxCharges" xlink:label="etn_AcquisitionIntegrationPretaxCharges" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentReportingInformationAssets" xlink:label="us-gaap_SegmentReportingInformationAssets" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_Goodwill" xlink:label="us-gaap_Goodwill" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="us-gaap_IntangibleAssetsNetExcludingGoodwill" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_SegmentReportingInformationCorporateAssets" xlink:label="etn_SegmentReportingInformationCorporateAssets" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_Assets" xlink:label="us-gaap_Assets" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_PaymentsToAcquireSegmentPropertyPlantAndEquipments" xlink:label="etn_PaymentsToAcquireSegmentPropertyPlantAndEquipments" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_PaymentsToAcquireCorporatePropertyPlantAndEquipments" xlink:label="etn_PaymentsToAcquireCorporatePropertyPlantAndEquipments" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentReportingInformationDepreciationExpense" xlink:label="us-gaap_SegmentReportingInformationDepreciationExpense" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_CorporateDepreciationExpense" xlink:label="etn_CorporateDepreciationExpense" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_Depreciation" xlink:label="us-gaap_Depreciation" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_BusinessSegmentAndGeographicRegionInformationTextualsAbstract" xlink:label="etn_BusinessSegmentAndGeographicRegionInformationTextualsAbstract" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_EntityWideNumberOfMajorCustomers" xlink:label="etn_EntityWideNumberOfMajorCustomers" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_EntityWideMajorCustomerRevenueAccountedForPercentage" xlink:label="etn_EntityWideMajorCustomerRevenueAccountedForPercentage" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_EntityWideDisclosureOnGeographicAreaRevenueFromExternalCustomersAttributedToEntitysCountryOfDomicile" xlink:label="etn_EntityWideDisclosureOnGeographicAreaRevenueFromExternalCustomersAttributedToEntitysCountryOfDomicile" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries" xlink:label="us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:to="us-gaap_StatementBusinessSegmentsAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentBusinessDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentFourMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentOneMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentTwoMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentFiveMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentSevenMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentThreeMember" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_TotalMember" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentBusinessDomain" xlink:to="etn_SegmentSixMember" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="us-gaap_SalesRevenueNet" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="us-gaap_SegmentReportingInformationOperatingIncomeLoss" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="us-gaap_SegmentReportingInformationAmortizationExpense" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="etn_InterestExpenseNet" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="etn_PensionAndOtherPostretirementBenefitsExpense" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="etn_StockOptionExpense" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="etn_OtherCorporateExpenseNet" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="etn_IncomeLossFromContinuingOperationsBeforeIncomeTaxes" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="us-gaap_IncomeTaxExpenseBenefit" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="us-gaap_ProfitLoss" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="us-gaap_NetIncomeLoss" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="etn_AcquisitionIntegrationChargesAbstract" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_AcquisitionIntegrationChargesAbstract" xlink:to="etn_AcquisitionIntegrationPretaxCharges" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="us-gaap_SegmentReportingInformationAssets" order="16" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="us-gaap_Goodwill" order="17" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="us-gaap_IntangibleAssetsNetExcludingGoodwill" order="18" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="etn_SegmentReportingInformationCorporateAssets" order="19" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="us-gaap_Assets" order="20" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="etn_PaymentsToAcquireSegmentPropertyPlantAndEquipments" order="21" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="etn_PaymentsToAcquireCorporatePropertyPlantAndEquipments" order="22" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" order="23" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="us-gaap_SegmentReportingInformationDepreciationExpense" order="24" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="etn_CorporateDepreciationExpense" order="25" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingEntityConsolidatedRevenueAbstract" xlink:to="us-gaap_Depreciation" order="26" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="etn_BusinessSegmentAndGeographicRegionInformationTextualsAbstract" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_BusinessSegmentAndGeographicRegionInformationTextualsAbstract" xlink:to="etn_EntityWideNumberOfMajorCustomers" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_BusinessSegmentAndGeographicRegionInformationTextualsAbstract" xlink:to="etn_EntityWideMajorCustomerRevenueAccountedForPercentage" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_BusinessSegmentAndGeographicRegionInformationTextualsAbstract" xlink:to="etn_EntityWideDisclosureOnGeographicAreaRevenueFromExternalCustomersAttributedToEntitysCountryOfDomicile" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="etn_BusinessSegmentAndGeographicRegionInformationTextualsAbstract" xlink:to="us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries" order="4" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/BusinessSegmentAndGeographicRegionInformationDetails1" xlink:title="0614 - Disclosure - Business Segment and Geographic Region Information (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="us-gaap_StatementBusinessSegmentsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentBusinessDomain" xlink:label="us-gaap_SegmentBusinessDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentBusinessDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/BusinessSegmentAndGeographicRegionInformationDetails" xlink:title="06141 - Disclosure - Business Segment and Geographic Region Information (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToIndividualForeignCountriesTable" xlink:label="us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToIndividualForeignCountriesTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="us-gaap_StatementGeographicalAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="us-gaap_SegmentGeographicalDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_CanadaMember" xlink:label="etn_CanadaMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_LatinAmericaMember" xlink:label="etn_LatinAmericaMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_EuropeMember" xlink:label="etn_EuropeMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_AsiaPacificMember" xlink:label="etn_AsiaPacificMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToIndividualForeignCountriesLineItems" xlink:label="us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToIndividualForeignCountriesLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToEntitysCountryOfDomicile" xlink:label="us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToEntitysCountryOfDomicile" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries" xlink:label="us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersEliminations" xlink:label="etn_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersEliminations" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SalesRevenueNet" xlink:label="us-gaap_SalesRevenueNet" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToIndividualForeignCountriesTable" xlink:to="us-gaap_StatementGeographicalAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementGeographicalAxis" xlink:to="us-gaap_SegmentGeographicalDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentGeographicalDomain" xlink:to="etn_CanadaMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentGeographicalDomain" xlink:to="etn_LatinAmericaMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentGeographicalDomain" xlink:to="etn_EuropeMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentGeographicalDomain" xlink:to="etn_AsiaPacificMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToIndividualForeignCountriesLineItems" xlink:to="us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToIndividualForeignCountriesTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToIndividualForeignCountriesLineItems" xlink:to="us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToEntitysCountryOfDomicile" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToIndividualForeignCountriesLineItems" xlink:to="us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToIndividualForeignCountriesLineItems" xlink:to="etn_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersEliminations" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToIndividualForeignCountriesLineItems" xlink:to="us-gaap_SalesRevenueNet" order="4" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/BusinessSegmentAndGeographicRegionInformationDetails" xlink:title="06141 - Disclosure - Business Segment and Geographic Region Information (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="us-gaap_StatementGeographicalAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="us-gaap_SegmentGeographicalDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementGeographicalAxis" xlink:to="us-gaap_SegmentGeographicalDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/BusinessSegmentAndGeographicRegionInformationDetails" xlink:title="06141 - Disclosure - Business Segment and Geographic Region Information (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfEntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesByCountryTable" xlink:label="us-gaap_ScheduleOfEntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesByCountryTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="us-gaap_StatementGeographicalAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="us-gaap_SegmentGeographicalDomain" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_CanadaMember" xlink:label="etn_CanadaMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_LatinAmericaMember" xlink:label="etn_LatinAmericaMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_EuropeMember" xlink:label="etn_EuropeMember" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_AsiaPacificMember" xlink:label="etn_AsiaPacificMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesLineItems" xlink:label="us-gaap_EntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EntityWideDisclosureOnGeographicAreasLongLivedAssetsInEntitysCountryOfDomicile" xlink:label="us-gaap_EntityWideDisclosureOnGeographicAreasLongLivedAssetsInEntitysCountryOfDomicile" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EntityWideDisclosureOnGeographicAreasLongLivedAssetsInForeignCountries" xlink:label="us-gaap_EntityWideDisclosureOnGeographicAreasLongLivedAssetsInForeignCountries" />
    <link:loc xlink:type="locator" xlink:href="etn-20101231.xsd#etn_EntityWideDisclosureOnGeographicAreasLongLivedAssetsEliminations" xlink:label="etn_EntityWideDisclosureOnGeographicAreasLongLivedAssetsEliminations" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="us-gaap_PropertyPlantAndEquipmentNet" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfEntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesByCountryTable" xlink:to="us-gaap_StatementGeographicalAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_EntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesLineItems" xlink:to="us-gaap_ScheduleOfEntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesByCountryTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesLineItems" xlink:to="us-gaap_EntityWideDisclosureOnGeographicAreasLongLivedAssetsInEntitysCountryOfDomicile" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesLineItems" xlink:to="us-gaap_EntityWideDisclosureOnGeographicAreasLongLivedAssetsInForeignCountries" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesLineItems" xlink:to="etn_EntityWideDisclosureOnGeographicAreasLongLivedAssetsEliminations" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesLineItems" xlink:to="us-gaap_PropertyPlantAndEquipmentNet" order="4" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://eaton.com/role/BusinessSegmentAndGeographicRegionInformationDetails" xlink:title="06141 - Disclosure - Business Segment and Geographic Region Information (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="us-gaap_StatementGeographicalAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="us-gaap_SegmentGeographicalDomain" />
  </link:definitionLink>
</link:linkbase>