HWK3 series control and protection switch appliances are mainly used in the circuit of AC 50HZ (60HZ), rated working voltage to 690V. Rated working current 1A to 125A, motor power 0.12KW to 55KW, mainly used for the on-off control of the circuit, and fault protection of line load. It adopts a modular integrated structure, which integrates the main functions of circuit breakers, contactors, overload relays, starters, isolators and other products. One product can replace the original multi-component combination.