KYN28A-□ (GZS1) indoor metal armored central removable switchgear (referred to as central cabinet) is a three-phase AC 50Hz indoor complete power distribution device, used to receive and distribute 3-24kV network power and Control, protect and monitor the circuit. Various types of microcomputer integrated relay protection devices can be installed on the panel of the relay compartment of this product, and the intelligent control of the system can be realized. It has the functions of remote control, telemetry, remote signaling and remote adjustment. Control the field network. It also has the functions of preventing misoperation of circuit breakers, preventing pushing and pulling handcarts with load, preventing the grounding switch from being turned on and off, preventing the grounding switch from transmitting electricity at the grounding position, and preventing mistakenly entering the live interval, namely the "five preventions" for short. The cabinet can be equipped with VSI (ie ZN63) and ZN□ vacuum circuit breakers, as well as imported VD4 vacuum circuit breakers and VC series vacuum contactors.