The working principle of the vacuum circuit breaker is mainly based on the characteristic that when the current flows through the zero point in high vacuum, the plasma rapidly diffuses and extinguishes the arc. Specifically, when the current in the circuit exceeds a preset threshold, the vacuum circuit breaker cuts off the circuit to prevent electrical equipment from being affected by problems such as overload and short circuit. When the current in the circuit drops below a safe value, the vacuum circuit breaker will automatically close to maintain the normal operation of the circuit.

The main functions of vacuum circuit breakers include protecting electrical equipment, ensuring personal safety, improving circuit efficiency and saving energy. When problems such as overload and short circuit occur in the circuit, the vacuum circuit breaker will immediately cut off the circuit to prevent damage to electrical equipment. At the same time, the vacuum circuit breaker can quickly and accurately detect circuit abnormalities and cut off the circuit to avoid dangerous events such as electrical equipment failure and electric shock. In addition, vacuum circuit breakers can reduce the waste of current and improve the efficiency of the circuit by precisely controlling the circuit. When cutting off the circuit, the vacuum circuit breaker will not produce arcs and explosions, thus consuming less energy.

In general, the vacuum circuit breaker is an important electrical switching device that is widely used in various circuits. It not only protects electrical equipment and personal safety, but also plays an important role in improving circuit efficiency and saving energy.