Switchgear: refers to a complete set of power distribution device assembled by primary equipment and secondary equipment according to a certain line plan, which is used to control and protect the line and equipment, divided into fixed and hand-operated, and according to the voltage level of the input and outlet line, it can be divided into high voltage switchgear (fixed and hand-operated) and low voltage switchgear (fixed and drawer type). The structure of the switchgear is generally similar, mainly divided into bus room, circuit breaker room, secondary control room (instrument room), feeder room, and there is generally steel plate isolation between the rooms.



Internal components include: bus (bus bar), circuit breaker, conventional relay, integrated relay protection device, metering instrument, isolation knife, indicator light, grounding knife, etc.