VS1-12 indoor high - voltage vacuum circuit breaker is a three - phase AC 50Hz rated voltage 12kV indoor switch equipment of power system . It is used as the protection and control unit of power grid equipment and power cquipment of industrial and mining enterprises . It is suitable for frequent operation under rated operating current or for short circuit current . 

The circuit breaker adopts the integral design of the actuating mechanism and the breaker body , which can be used as a fixed installation unit or a special propulsion mechanism to form ahandcart unit .

Environmental conditions 

Ambient air temperature : upper limit +40℃. Lower limit -15℃ ;

Altitude : less than 1000m( for higher altitude , is rated insulation level increase );

Amplitude of vibration: the earthquake intensity is not more than 8 degrees ;

The daily average value of  air relative humidity is not greater than 95%, 

and the average monthly value is not greater than 90% ;

No Fire , explosion , danger , serious pollution , chemical corrosion and violent vibration .