... current leakage, low voltage,over voltage,temprature; 1,PurposesQJZ series of mine explosion-proof and safe double-speed, double-circuit ... motors, and it also can protect power supply circuits of motors. 2,Protective functions1) ABD8 digital electronic protector is ... used;2) The starter has various protective functions of short-circuit, overload, phase loss, current leakage, undervoltage, ...