The medium voltage switchgear is a kind of electrical equipment. The external line first enters the main control switch in the switchgear, and then enters the sub-control switch, and each branch is set according to its needs. Such as meters, automatic control, motor magnetic switches, various AC contactors, etc.

1. After the vacuum circuit breaker trolley in the high voltage switchgear is closed at the test position, the trolley circuit breaker cannot enter the working position. (Prevent closing with load)

2. When the grounding knife in the high-voltage switchgear is in the closed position, the trolley circuit breaker cannot be closed. (Prevent closing with ground wire)

3. When the vacuum circuit breaker in the high-voltage switchgear is closing, the back door of the cabinet is locked with the cabinet door by the mechanism on the grounding knife. (Prevent the charging interval by mistake).

4. The vacuum circuit breaker in the high-voltage switchgear is closed when it is working, and the grounding knife cannot be put in. (Prevent the live ground wire from hanging)

5. The vacuum circuit breaker in the high-voltage switch cabinet cannot exit the working position of the trolley circuit breaker when it is closed and running. (Prevent load operation of the knife)