Of VS1-12 indoor high voltage vacuum circuit breaker 

 VS1-12/630-20 (ZN63A-12/630-20), VS1-12/1000-20 (ZN63A-12/1000-20), VS1-12/1250-20 (ZN63A-12/1250-20) 
 VS1-12/630-25 (ZN63A-12/630-25), VS1-12/1000-25 (ZN63A-12/1000-25), VS1-12/1250-25 (ZN63A-12/1250-25) 
 VS1-12/1250-31.5 (ZN63A-12/1250-31.5), VS1-12/1600-31.5 (ZN63A-12/1600-31.5) 
 Of VS1-12 (ZN63A-12) type indoor high voltage vacuum circuit breaker, is three-phase AC 50Hz rated voltage indoor switchgear of 12kV power system, grid equipment, industrial and mining enterprises, power equipment, protection and control unit. For frequent operation in the rated operating current or repeatedly breaking the short circuit current place. 
 The circuit breaker operating mechanism and circuit breaker body-in-one design, either as a fixed installation unit can be equipped with a special advance mechanism, the composition of the role of the withdrawable unit. 

 Ring with environment 

 A ambient air temperature: up to +40 ° C, the lower limit of -15 ° C; 
 b Altitude: ≤ 100m (For higher altitudes, the rated insulation level corresponding increase); 
 c amplitude the: earthquake columns degree no more than 8 degrees; 
 d air relative humidity daily average not more than 95 percent, on average less than 90% 
 e no fire, explosion hazard, serious pollution, chemical corrosion and violent vibration of the place.