12/24kV Indoor Vacuum Circuit Breaker, ZN63A(VS1)

These vacuum circuit breakers are designed for three phase AC 50Hz power system with rated voltages of 12/24kV, used as protection and control unit for grid equipment and power equipment of industry and mining enterprises. They are suitable for areas where frequent operations of rated operating current or multiple switching of short circuit current are required. The operating mechanism is integrated into the circuit breaker body. The circuit breaker can be installed as a fixed unit, or equipped with a truck or a withdrawable part to easily move into the switchgear.

Environmental Conditions Ambient temperature: up to 40°C, greater than -15°C; Altitude: lower than 1000 m; Ambient humidity:
Daily average relative humidity: ≤ 95%;
Monthly average relative humidity: ≤ 90%;
Daily average vapor pressure: ≤2.2×10-3 MPa;
Monthly average vapor pressure: ≤1.8×10-3 MPa; Earthquake intensity: ≤ magnitude 8; Areas without risks of fire, explosion, pollution, chemical corrosion and severe vibration; Technical Parameters

Item	Unit	Parameter
Rated voltage	kV	12		24
Rated lightning impulse withstand voltage	kV	75/85		125/145
Power frequency withstand voltage (1 min)	kV	42/48		65/79
Rated short-circuit making current	kA	25,31.5,40		25,31.5,40
Rated current	A	630, 1250 1600, 2000 2500, 3150		630, 1250 1600, 2000 2500, 3150
Rated thermal current	kA	25,31.5,40		25,31.5,40
Rated dynamic current(peak)	kA	63,80,100		63,80,100
Rated short-circuit breaking current(Peak)	kA	63,80,100		63,80,100
Rated operating sequence		0—0.3—CO—180s—CO		0—0.3—CO—180s—CO
		〇-I80s-CO-180s-C〇		〇-I80s-CO-180s-C〇
Mechanical endurance	Times	10000		10000