It is applicable to industrial and mining enterprises, power plants and power transformation and distribution stations as the switchgear for controlling and protecting the loads of high-voltage motors, transformers, induction furnaces, etc. The equipment is composed of high-voltage vacuum contactor and high-voltage fuse. The high-voltage vacuum contactor can carry out frequent operation load, and the high-voltage fuse can carry out high short circuit breaking. Its combination function is superior to the circuit breaker scheme, and the cost is lower than the circuit breaker. It is widely used in the field of control and protection of high-voltage electric machines.