This indoor high voltage vacuum circuit breaker, also called VCB, It can match with the cabinets, such ... -12(ZN63A) indoor high voltage vacuum circuit breaker, also called VCB, is a fixed type circuit breaker developed and designed on the basis of ... XGN2, GG1A and GGX2 and replace the disqualified old breaker (eg. oil circuit breaker). The circuit breaker owns many merits, such as few changes, low ...