Main application

FZ (R) N21-12D indoor high-voltage vacuum load switch and composite apparatus, used for circuit AC 50Hz, rated voltage 12kV, plays power distribution, control and protection of electrical equipment function. It can replace the expensive circuit breaker in a certain range, thus saving the power grid investment costs. The combination of electrical appliances can be widely used in the ring network power supply system in urban and rural areas. Under normal operation condition, it can close, bearing and breaking rated current, also can break the specified short-circuit current under abnormal conditions, especially suitable for the control anddistribution and protection of transformer.

The use of environmental conditions

1. Altitude: no more than 1000m;

2. The environment temperature: upper limit +40℃, lower limit -30℃;

3. Relative humidity: daily average value is not greater than 95%, monthly average is not greater than 90%;

4. Saturated steam pressure: daily average value is not higher than 2.2×10-3 Mpa, monthly average is not higher than 1.8×10-3 Mpa;

5. No severe vibration, no corrosive gas, no fire, no explosion danger place