*good quality *OEM, experienced manufacturer 3VU Circuit breakers areapplicable for circuit of AC 50Hz(or60Hz),rated insulation Voltage750V,rated operating Voltage under AC 660V,rated operting current0.1-52A which is used for protecting the motor against overload,short-circuit and phase-failure.It can also be used for staring and breaking the starter of motor,and the circuit protection in the ...