The idea of ​​using a vacuum medium to extinguish the arc was put forward at the end of the 19th century, and the earliest vacuum interrupter was produced in the 1920s. However, due to the limitations of vacuum technology, materials and other technical levels, it was not practical at that time.

The main problem of the vacuum interrupter is that the degree of vacuum is reduced. The main reasons for the decrease in vacuum degree are as follows.

The high-voltage vacuum circuit breaker is one of the key electrical appliances related to whether the power system can be effectively controlled. Only by maintaining its good operating state can the normal and efficient operation of the circuit system be ensured.

Introduction of vacuum circuit breaker: The vacuum circuit breaker and vacuum contactor are actually the same as the air contactor of the air circuit breaker, except that the arc extinguishing unit is placed in a vacuum environment, which enhances the adaptability to the environment.

Vacuum circuit breakers can be used to distribute electric energy, start asynchronous motors infrequently, and protect power lines and motors. When they have serious overload or short-circuit and under-voltage faults, they can automatically cut off the circuit.

Since vacuum circuit breakers are basically exposed to the air, the occurrence of rust is almost unavoidable, especially for equipment that is outside for a long time.