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  <xs:element id="lfus_USSeniorNotesSeriesADue2022Member" abstract="true" name="USSeniorNotesSeriesADue2022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_USSeniorNotesSeriesAMember" abstract="true" name="USSeniorNotesSeriesAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_USSeniorNotesAAndBDue2025And2030Member" abstract="true" name="USSeniorNotesAAndBDue2025And2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_USSeniorNotesSeriesADue2025Member" abstract="true" name="USSeniorNotesSeriesADue2025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_USSeniorNotes2032Member" abstract="true" name="USSeniorNotes2032Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_LineOfCreditMinimumIncreaseToBorrowingAmount" abstract="false" name="LineOfCreditMinimumIncreaseToBorrowingAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lfus_DebtIssuanceExpense" abstract="false" name="DebtIssuanceExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lfus_NumberOfSeries" abstract="false" name="NumberOfSeries" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="lfus_DerivativeNameAxis" abstract="true" name="DerivativeNameAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="lfus_DerivativeNameDomain" abstract="true" name="DerivativeNameDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_August2025CollarsMember" abstract="true" name="August2025CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_September2025CollarsMember" abstract="true" name="September2025CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_November2025CollarsMember" abstract="true" name="November2025CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_November2025CollarsIIMember" abstract="true" name="November2025CollarsIIMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_January2026CollarsMember" abstract="true" name="January2026CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_February2026CollarsMember" abstract="true" name="February2026CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_March22026CollarsMember" abstract="true" name="March22026CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_March302026CollarsMember" abstract="true" name="March302026CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_June12026CollarsMember" abstract="true" name="June12026CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_June292026CollarsMember" abstract="true" name="June292026CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_August32026CollarsMember" abstract="true" name="August32026CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_August312026CollarsMember" abstract="true" name="August312026CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_September292026CollarsMember" abstract="true" name="September292026CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_November22026CollarsMember" abstract="true" name="November22026CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_November302026CollarsMember" abstract="true" name="November302026CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_January42027CollarsMember" abstract="true" name="January42027CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_February22027CollarsMember" abstract="true" name="February22027CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_March12027CollarsMember" abstract="true" name="March12027CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_April52027CollarsMember" abstract="true" name="April52027CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_May32027CollarsMember" abstract="true" name="May32027CollarsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_DefinedBenefitPlanExpectedDirectPaymentsNextFiscalYear" abstract="false" name="DefinedBenefitPlanExpectedDirectPaymentsNextFiscalYear" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lfus_ChangeInObligationPensionBenefitsPercent" abstract="false" name="ChangeInObligationPensionBenefitsPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lfus_AccumulatedForeignCurrencyTranslationAdjustmentsNetInvestmentHedgeMember" abstract="true" name="AccumulatedForeignCurrencyTranslationAdjustmentsNetInvestmentHedgeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_AccumulatedForeignCurrencyTranslationAdjustmentMember" abstract="true" name="AccumulatedForeignCurrencyTranslationAdjustmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_NumeratorAbstract" abstract="true" name="NumeratorAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="lfus_DenominatorAbstract" abstract="true" name="DenominatorAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="lfus_A2024ShareRepurchaseProgramMember" abstract="true" name="A2024ShareRepurchaseProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_OtherCountriesMember" abstract="true" name="OtherCountriesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_PowersemMember" abstract="true" name="PowersemMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_EBTechMember" abstract="true" name="EBTechMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lfus_ATECMember" abstract="true" name="ATECMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
