A vacuum circuit breaker (VCB) is a power distribution device that switches and interrupts current during load or fault conditions to isolate high power sources and help manage safe and reliable power distribution.

VCBs are used within switchgear enclosures together with protection relays for MV applications in power distribution systems.

In a Vacuum CB, current flow is interrupted in a vacuum chamber with a high insulation dielectric strength to minimize the arc energy created by switching of up to 24 kV.

Vacuum CBs are often replaceable devices that combine a compact design, long service life, and minimal maintenance when compared to other circuit breaker types.

VCBs do not use gases to isolate power, they are air-based and use vacuum principles.

What is a Vacuum Circuit Breaker?

A vacuum circuit breaker is an automatically operated electrical switch, designed to protect a power system and its connected devices and equipment from harm caused by overload or short circuits. Its basic function is to interrupt the current flow using fixed and moving contacts that are permanently sealed in a vacuum interrupter.

Benefits of Vacuum Circuit Breakers:

Optimized for high mechanical and electrical stresses.

Flexible application as fixed or withdrawable, compact, all-in-one designs.

Standardized designs for flexible application and short delivery times.

Can be exchanged or retrofitted to existing panels to extend equipment life.

Today's vacuum circuit breakers are exceptionally durable, making them ideal for clearing faults in many applications. Designed and optimized by experienced manufacturers to be lighter, more cost effective, and require less maintenance, while also boasting a longer lifespan than ever before.