... manufacturer about switchgear conponents,such as voltage indicator,heater,short circuit and earth fault indicator,blocking magnet,Led ... transmission6. Low voltage of the battery alarming indicationTechnical data: Short circuit alarming current: 150A to 2000AEarthing alarming current:10A ... ,20 A,30A,40A,50A,60A+-1Temperature range : -15 to +60Humidity: <=95%Earth lead length : ...