Answer Posted / n. gopala krishna

difference between vcb and acb. vcb is vacume circuit
breaker acb is air circuit breaker . in vcb switching
contacts fixed in vacume cylender. in acb switching
contacts arranging in openly in airbut other all mechanisim
is same both breakers having closing coil and tripping coil
and spring charge motor all are having but vcb breakers
using in high voltage side to reduse the arc at on off
time. but acb can use in low voltage side only

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