BSM seriesresidualcurrentcircuitbreakers havearesidualcurrentoperatedelectromechanicalreleasewhichoperateswithoutanyauxiliarysourceofsupplytoopenacircuitautomaticallyinthecaseofanearthleakagefaultbetweenphaseandearthgreaterthanorequaltoathresholdof10mA,30mA,100mA,300mAor500mA.Specification:1.SeriesBSMLeakageBreakersaretheprotectorforpureelectromagneticresidualcurrentoperation.2.Theoperationfunctionisunrelatedtocircuitvoltage,butoperationisreliable.3.Itcanbereliablyoperatedonthelossofphaseorneutral.4.Thecapacityofresistingelectromagneticinterferenceisstrong.