◆ General
VS1 (ZN63A) Type Indoor High Voltage Vacuum Circuit Breaker is used in switchgears for Electric power system as the electric facility
and protecting unit in industrial and mining enterprise, power plants and power distribution substation. For the excellent characteristics of
the vacuum circuit breaker, it is especially suitable to be used in the place with frequent operation at rated current or with multi-short
current. This type of circuit breaker complies with the standard of GB1984-89 AC HV Circuit Breaker, JB3855-1996 3.6~40.5KV
Indoor AC HV Vacuum Circuit Breaker, DL403-2000 10~40.5KV HV Vacuum Circuit Breaker Ordering Technical Requirement, and
IEC56 (edit 87). The mechanism and circuit breaker are designed integrated. They are mounted in the front and back respectively, with
reliable interlock function and can be amounted as fixed unit or be mounted with underpan to form the trolley unit.
◆Service condition
◇Normal condition
Ambient temperature +40℃~ －15℃
Ambient humidity daily average relative humidity ≤95%
daily average steam pressure 2.2×10-3MPa
monthly average relative humidity 90%
montly steam pressure 1.8×10-3MPa
Altitude ≤1000m
Earthquake degree < 8 degree
Surrounding condition: no dripping water, no inflammable and explosive medium, no chemical erosion gas
and intense convulse.
◇Special service condition
Customers can communicate with us if the service condition is very special.
◆Technical data
◇Technical data for circuit breaker
Main technical data for circuit breaker

 

Rated voltage														12kV
Rated frequency														50Hz
Rated lightning impulse withstand voltage (phase-to-phase, phase-to-earth)/ open contacts														(75)/ 85kV (peak value)
Rated 1min power frequency (phase-to-phase, phase-to-earth)/ between open contacts														(42) /48kV (effective value)
Rated operation sequence														O-t-CO-t'-CO
Type of circuit breaker		Rated current	Rated breaking current (kA)				Rated short circuit making current (peak kA)				Rated short circuit duration time (s)				Rated short circuit breaking time (times)			Mechanical endurance (times)
VS1-12		630 1250	20/ 25				50/ 63				4				100			20000
		1250 1600 2000 2500	31.5				80				4				50			20000
		1250 1600 2000 2500 3150	40				100				4				30			10000
		3150 4000	50				125				4				20			10000
※ Notes: 20kA 25kA 31.5kA 40kA 50kA 4000A: force to cool wind are needed								t=0.3s t=180s		t'=180s t'=180s