A breaker is normally used to break a circuit. While breaking the circuit, the contact terminals will be separated. At the time of separation, an air gap is formed between the terminals. Due to the existing current flow, the air in the gap is ionized and results in the arc. Various mediums are used to quench this arc in respective CB’s. But in VCB the medium is vacuum gas. Since the air in the CB is having vacuum pressure the arc formation is interrupted. VCB’s can be used up to 11kv.
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