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) 
 VS1-12 (ZN63A-12)-type indoor high voltage vacuum circuit breakers, three-phase AC 50Hz 12kV power system for the fixed-voltage indoor switchgear, as the network equipment, industrial and mining equipment, power protection and control unit. Applies to the rated operating current of the frequent operation, or multiple short-circuit breaking current location. 
 The circuit breaker operating mechanism and circuit breaker body-in-one design, either as a fixed installation unit can also be equipped with a dedicated agency to promote, Used unit component role. 

 Ring with the environment 

 A ambient air temperature: up to +40 ℃, minimum -15 ℃; 
 b Altitude: ≤ 100m (For higher altitudes, the corresponding increase in the rated insulation level); 
 c Amplitude: Earthquake column is no more than 8 degrees; 
 d daily average relative humidity is less than 95%, on average less than 90% 
 e no fire, explosion, serious pollution, chemical corrosion and severe vibration.