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42(2007No.1)Abstract:Underratedvoltageandratedcurrenttocalculateshortcircuitcurrentcorrectlyandtoselectlow-voltagecircuitbreakproperlymayreduceshortcircuitetcbreakdownstotakeplaceinpowerdistributionnetworkandindustrialequipment.Descriptionwasmadeforthedefinitionandstandardofcircuitbreakbreakingcapacity,analysiswascarriedoutforselectionofratedshortcircuitbreakingcapacity,givingoutcalculationformulaofshortcircuitcurrent,havinganalyzedthatwheninselectionofratedshortcircuitbreakingcapacity,cautionsshouldbepaidwithattention.Keywords:circuitbreaker;protection;breakingcapacitySHENYuan-linSuzhouNo.1ElectricalAppliancesFactory,Suzhou215001,ChinaCalculationandSelectionofLow-voltageCircuitBreakerBreakingCapacity43(2007No.1)44(2007No.1)