What Is a Vacuum Circuit Breaker and How Does It Work?
A vacuum circuit breaker (VCB) is a type of switching device designed to interrupt electrical current in medium voltage applications. What makes VCBs unique is their use of a vacuum-sealed chamber as the arc-quenching medium.
When the breaker operates to interrupt a fault or disconnect a load, the current-carrying contacts inside the vacuum chamber separate. Because the chamber is devoid of air or other gases, the arc is extinguished almost instantly due to the high dielectric strength of the vacuum environment.
This mechanism provides:
Fast and reliable fault interruption
Minimal contact erosion
No risk of fire or explosion
No environmental contamination
Vacuum Circuit Breakers vs. Traditional Technologies
Type | Arc Medium | Maintenance | Fire Risk | Environmental Impact | Typical Use |
|---|---|---|---|---|---|
Vacuum (VCB) | Vacuum | Very Low | None | Minimal | 1–36kV (Best Choice) |
Air (ACB) | Air | Moderate | Possible | Moderate | Low & Medium Voltage |
Oil (OCB) | Oil | High | High | High | Legacy Systems |
As the table shows, vacuum circuit breakers clearly outperform older technologies in safety, performance, and ecological responsibility.
Why Choose Degatech Electric as Your VCB Provider?
Degatech Electric is a professional medium voltage switchgear and vacuum circuit breaker manufacturer based in China, with a strong focus on:
Quality manufacturing
International compliance
Custom engineering
Export-ready solutions
Their vacuum circuit breaker offerings include:
Rated voltage: 12kV, 24kV, 36kV
Various breaking capacities and current ratings
Customizable control and mounting options
Full compliance with IEC 62271-100, GB 1984, and other standards
? View Degatech Electric’s vacuum circuit breaker product line here
What sets Degatech Electric apart is their ability to deliver high-performance VCBs tailored to the needs of diverse industries, backed by responsive service and reliable global logistics.
Applications of Vacuum Circuit Breakers
Vacuum circuit breakers are used worldwide in:
Power generation plants (thermal, hydro, solar, wind)
Industrial facilities & factories
Utility substations & distribution networks
Mining & heavy industry
Smart grid & automation systems
Their compact size, safety features, and long service life make them ideal for both new installations and retrofit projects.
Final Thoughts: Trust Degatech Electric for Your MV Protection Needs
When it comes to ensuring the safety, reliability, and efficiency of medium voltage electrical systems, few components matter as much as the circuit breaker. Vacuum circuit breakers offer a superior combination of performance, safety, and environmental responsibility — and Degatech Electric is a manufacturer you can trust to deliver them at the highest standard.
? Explore Degatech Electric’s vacuum circuit breakers now
? Contact our team or request a quote via our main website
