Vacuum Circuit Breaker Working and Applications.
1.Construction of Vacuum Circuit Breaker
2.Working of Vacuum Circuit Breaker


Advantages of VCB

Vacuum offers the utmost insulating strength. So it has extreme superior arc quenching properties than any other medium.

The vacuum circuit breaker has a long life.
Unlike Oil Circuit Breaker (OCB) or air blast Circuit Breaker (ABCB), the explosion of VCB is avoided. This enhances the safety of the operating personnel.
No fire hazard
The vacuum CB is fast in operation so ideal for fault clearing. VCB is suitable for repeated operation.
Vacuum circuit breakers are almost maintenance free.
No exhaust of gas to the atmosphere and Noiseless operation.
Disadvantages of VCB

The main disadvantage of VCB is that it is uneconomical at voltages exceeding 38 kVolts.
The cost of the breaker becomes excessive at higher voltages. This is due to the fact that at high voltages (above 38 kV) more than two numbers of the circuit breaker are required to be connected in series.
Moreover, the VCBs production is uneconomical if produced in small quantities.

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