1,perfect design,, 2,free maintance,no oil charging large capacity,no burning 3, vacuum circuit breaker ZN63-12E(VS1) series of vacuum circuit breaker is three-phase A.C. 50Hz indoor high-voltage distribution device with 12KV rated voltage and below which can match with GZS1 type cubical switchgear. It is suitable to control and protect transmission and distribution system such as power ...