It is applicable to three-phase AC 50Hz power system. It is mainly used for power transmission of power plants, small and medium-sized generators, power distribution of industrial and mining enterprises and public institutions, as well as power collection and transmission of secondary substations of electric power systems, and starting of large high-voltage motors, to realize control, protection and monitoring. This switch cabinet meets the requirements of GB/T11022, GB/T3906 and other standards, and has the interlocking function of preventing the loaded push-pull circuit breaker handcart, preventing the wrong opening and closing of the circuit breaker, preventing the closing of the circuit breaker when the grounding switch is in the closed position, preventing the wrong entry into the electrified compartment, and preventing the wrong closing of the grounding switch when it is electrified.