Vacuum Circuit Breaker (VCB) is a type of circuit breaker that utilizes vacuum as the arc extinction medium. The fixed and moving contacts are enclosed in a permanently sealed vacuum interrupter. When the contacts are separated in high vacuum, the arc is extinguished. VCB is commonly used for medium voltage applications, ranging from 11 KV to 33 KV. It is known for its reliable arc quenching properties and environmentally friendly operation.

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