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AddNO.8067WestXiang’AnRD,TorchHigh-TechIndustrialDistrict,Xiang’An,Xiamen,[e-mail]@SETfuse.comThermallyProtectedWireWoundResistor(TRXF)Thisisalatestdesignedpowerresistorwithovertemperatureandovercurrentprotectionfunction.Itcanavoidthepotentialriskofovertemperaturecausedbythewirewoundresistor(WWR)underasmallfaultcurrent.SETdevelopedacompactstructureinnovativelywhichintegratedthermalcutoffandwirewoundresistorinatubularcase.IthasthesamesizeandshapeasaresistorwithoutPCBredesign,offerhighersecurityandwave-soldering.NormalWWRisassembledbyusingalloywirehavingahighmeltingpoint,itcanbebrokenquicklyonlysufferingmorethan4X~5Xratedcur-rent.Whilethereisonlyasmallfaultcurrentthroughitsbody,itwouldheatcontinuouslyandreacharatherhightemperatureupto300-500.Itwilldamageothercomponentsandplasticaround.ThepopularsolutiontothisproblemistoconnectathermalfusewiththeWWRinseriesclosely.Ther-malfusewillbetriggeredbyWWR’sabnormalovertemperature.Butthisisnotabestsolution.Becausethermalfuserespondsslowlyduetolowheattransferefficiency.Sotheriskofovertemperaturestillexists.Anothershortcomingisnotwavesoldering,occupymorespacesonthePCB.NewFailsafefusingresistorSeriesPowerResistanceThermalLinkTFRatedCurrentTRXF11W0.47~51Ω2%,5%,2212ATRXF22W3~68Ω2%,5%,2212AtoleranceSpecificationsCautions:ThefusingresistorwillturnREDandreachaveryhightemperatureupto300~500undersmallfaultcurrentwithoutbrokenforalongtime.ItisverydangeroustothePCB.UL1412/IEC60691/UL60691Whythefusingresistorneedprotection?NormalTurnREDFusingΦdL2L3L4H1H30.560.291131171141222L1131ΦD0.430.2L53.50.5H2191H4262(mm)