... ).2,voltage specification for AC220V and AC380V,to control the motor secondary circuit voltage and decide .3,specification for 300A,400A,500A ... ≤2.0W :Working conditions Three-phase perforation adapt to the circuit:AC380V,AC660VWorking power:AC220Valtitude less than 2500 meters Working temperature ... temperature :-25°C~ +70°C, 2012 hot sales BW800-1 Motor protection device(economic modle)