Absorbing foreign advanced technologies and based upon domestic characteristics, this equipment is a new generation of self-designed and developed equipment. Meeting requirements of GB3906 standards, it is suitable for the power system with three-phase AC rated voltage 40.5kV and rated frequency 50Hz to receive and distribute electric energy and control, protect and test the circuit. The product is widely used for the general power system and frequently-operated places. The cabinet structure adopts assembled type and the circuit breaker adopts handcart floor type structure or mid-set structure, so repair and maintenance is convenient.