Actually the thing is vacuum has high arc quenching property compare to air because in VCB ,the dielectric strengths equal to 8 times of air . That why always vacuum used as in HT breaker and air used as in LT.
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Actually the thing is vacuum has high arc quenching property compare to air because in VCB ,the dielectric strengths equal to 8 times of air . That why always vacuum used as in HT breaker and air used as in LT.