... conponents,such as voltage indicator,heater,short circuit and earth fault indicator,blocking magnet,Led light,voltage sensor,temperature and humidity ... that maintenance staff can locate and then cut off the fault section circuit quickly based on its signaling information. And ... ,2hrs,4hrs Output relay : 120 V AC 1A, 30V DC 2ACutting hole dimension: 91*44mmMain controller dimension :95*50*80mmCutting ...