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. The switchgear is an electrical equipment, and the external line first enters the main control switch in the cabinet, and then enters the sub control switch. Each branch is set according to its needs. Such as instruments, self-control, motor magnetic switches, various AC contactors, etc. Some also have high voltage and low voltage room switchgear, high voltage busbars, such as power plants, etc. Some also have low cycle load shedding to protect the main equipment.

The switchgear AC low-voltage distribution cabinet is a new type of low-voltage distribution cabinet designed according to the requirements of the Ministry of Energy, power users, and design departments, based on the principles of safety, economy, rationality, and reliability The product has the characteristics of high breaking capacity, good dynamic and thermal stability, flexible electrical scheme, convenient combination, strong series and practicality, novel structure, and high protection level Can be used as a replacement product for low-voltage switchgear.

When the grounding knife inside the high-voltage switchgear is in the closed position, the small car circuit breaker cannot be closed. When the vacuum circuit breaker inside the high-voltage switchgear is closed, the mechanical connection between the cabinet door and the grounding knife is used to lock the cabinet door. When the vacuum circuit breaker inside the high-voltage switchgear is closed during operation, the grounding knife cannot be engaged. The vacuum circuit breaker inside the high-voltage switchgear cannot exit the working position of the small car circuit breaker during operation.