The high and low voltage switch cabinet is a kind of electrical equipment. The external line first enters the main control switch in the cabinet, and then enters the sub-control switch, and each branch is set according to its needs. Such as instrumentation, automatic control, motor magnetic switch, various AC contactors, etc., some also have high-voltage room and low-voltage room switch cabinets, high-voltage busbars, such as power plants, etc., and some also have low-cycle protection for main equipment Load shedding.