24kv Vacuum Circuit Breaker

1. General
TZN3-24 series of indoor HV vacuum circuit breakers are used in the switchgear rated 24 kV, 50(60)Hz. They are suitable for making different types of loads and frequent operation, to protect and control the electric equipment in industrial & mining enterprises, power plants and substations, especially suitable for breaking important loads.

TZN3-24 indoor AC high-voltage vacuum circuit breaker is a vacuum-insulation switching component. The electric conduction part can be made with embedded poles or insulation canisters.

Its mechanical lifespan can achieve the class-M2 circuit breaker, I. E. Maintenance free for 10, 000 times. The mechanical lifespan is up to 20, 000 times (60, 000 times, with permanent-magnetic device).

Small size, simple structure, highly reliability, modular design and excellent technics.

2. Normal Service Condition
Ambient temperature: -15 degree ~ +40 degree
Altitude: ≤1000m
Relative humidity: Daily average relative humidity ≤ 95%; Monthly average relative humidity ≤ 90%
Free from fire, explosion, heavy pollution, chemical corrosion and severe vibration.
Earthquake intensity ≤ 8 degree
If the service condition differs from the above, the user should consult it with manufacturer.

3. Technical Parameters
Rated voltage kV 24
Rated frequency Hz 50(60)
Rated short-time power frequency withstand voltage(1 min) kV 60
Rated lightning impulse withstand voltage kV 125
Rated current A 630 1250 630 1250 1250 1600
Rated short-time withstand current kA 20 25 31.5
Rated peak withstand current kA 50 63 80
Rated short-circuit breaking current kA 20 25 31.5
Rated short-circuit making current kA 50 63 80
Rated operating sequence O-0.3s-CO-180s-CO O-180s-CO-180s-CO(40kA)
Short-circuit current breaking times 274
Rated capacitor bank breaking current A 630/400
Mechanical endurance times 10000