Concept of Vacuum Circuit Breaker

2025-10-11 15:34:48

A vacuum circuit breaker (VCB) is a type of switchgear used in power systems to open or close electrical circuits. Its most notable feature is the use of vacuum as the insulating and arc-quenching medium, enabling highly efficient insulation and arc extinction.

During operation, the vacuum circuit breaker contains an arc chamber. When current passes through, an electric arc forms within the vacuum environment but is quickly extinguished, ensuring the equipment’s safe and reliable operation. The VCB not only provides excellent insulation performance but also effectively prevents the spread of electric arcs, thereby reducing risks such as electric shock and equipment damage.

For high-voltage and ultra-high-voltage power systems, the use of vacuum circuit breakers is particularly crucial, as they help maintain a stable energy supply while offering strong interference resistance. In addition, their simple structure and easy maintenance make them an essential and widely used device in modern power systems.