This series of switchgear is suitable for use in 3.6-12KV, 50Hz, 630-3150A three-phase AC rated current, single bus and single busbar with bypass or double bus system for receiving and distributing electric energy, installed in the indoor places. The utility model can meet the requirements of various types of power plants, substations and industrial and mining enterprises. This series of switching equipment for metal enclosed structure, the protective class is IP4X, the main switchboard adopts ZN28A-10 series vacuum circuit breakers with CD10, CD17A series or CT19B series electromagnetic actuator spring actuator, the isolating switch adopts GN30-12 series rotary isolating switch, isolating switch series current GN22- 10. The main chain switch, isolation switch, grounding switch and cabinet door between the mandatory mechanical locking, in accordance with the "five anti" function, has the advantages of reasonable structure, safe and reliable, simple operation, convenient maintenance etc..