FZ(R)N21-12 Indoor Vacuum Load Switch

FZ(R)N21-12D indoor MV 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, bear and break rated current, also can break the specified short-circuit current under abnormal conditions, especially suitable for the control and distribution and protection of transformer.
Standard: IEC 60265-1,IEC 62271-105.

Selection

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

Technical data

Overall and mounting dimensions(mm)

1.Cabinet bracket
2.Disconnector
3.Fuse
4.Insulated tension pole
5.Upper bracket
6.Vacuum interrupter
7.Static contact
8.Insulator
9.Grounding knife
10.Grounding knife spring
11.Opening spring
12.The tripping driving device
13.Insulated tension
14.Main axle
15.Layshaft
16.Adjusting yoke
17.Spring operating
pole
mechanism