What is VCB?
VCB stands for vacuum circuit breaker. This type of circuit breaker uses vacuum media for quenching the arc. In VCB vacuum is used because the dielectric strength of the vacuum is far better than any type of medium. The vacuum is the superior dielectric medium of extinct using the arc compared to other mediums.
What is the purpose of vacuum conductors in electrical panel?
A vacuum interrupter uses a high vacuum to extinguish the arc between a pair of contacts. As the contacts move apart, current flows through a smaller area.
How does a VCB breaker work?
A breaker which used vacuum as an arc extinction medium is called a vacuum circuit breaker. In this circuit breaker, the fixed and moving contact is enclosed in a permanently sealed vacuum interrupter. When an arc is opened by moving apart the contacts in a vacuum, an interruption occurs at the first current zero.
Where is VCB used?
Vacuum Circuit Breaker or VCB is used for Medium Voltage applications. In VCB the contacts operation & arc quenching takes place inside bottles where Vacuum is present. SF6 circuit breakers are also used mainly in medium voltage applications.
What does ground fault mean on a vacuum interrupter?
Ground Fault (Phase Imbalance) – The ground fault or phase imbalance feature continuously checks for phase imbalance or unequal currents in each of the three phases. Protection from this condition is a common requirement for large three phase motors or other sensitive loads.
When would you use a vacuum circuit breaker?
Vacuum circuit breakers are compactly designed for safe operation, high reliability, and easy maintenance, and find a use for various types of high voltage circuits. They interrupt an electric circuit to prevent unwarranted current, caused by a short-circuit, typically resulting from an overload.
