FZN21/FZRN21-12 Indoor Vacuum Load Switch

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 -3 Mpa; 5. No severe vibration, no corrosive gas, no fire, no explosion danger place.

Technical data

Item	Unit	Parameter
Technical parameter of combinations
Rated voltage	kV	12
Rated frequency	Hz	50
The maximum rated current of the fuse	A	125
Transfer current	A	1550
The fuse triggered switch segment time	ms	40±5
Rated short-circuit breaking current	kA	31.5
Rated short-circuit closing current (prospective peak value)	kA	80
1min power frequency withstand voltage (vacuum fracture, interphase, phase to earth / isolation fracture)	kV	42/49
The lightning impulse withstand voltage (vacuum fracture, interphase, phase to earth / isolation fracture)	kV	75/85
Fuse impinger type		Medium-sized
Technical parameters of vacuum load switch of combined electrical appliance
Rated voltage	kV	12
Rated frequency	Hz	50
Rated current	A	630
Rated active load breaking current	A	630
Rated close loop breaking current	A	630
5% at rated load breaking current	A	31.5
Rated cable charging breaking current	A	10
Interrupting no load transformer capacity	kVA	1250
1min power frequency withstand voltage (vacuum fracture, interphase, phase to earth / isolation fracture)	kV	42/48
The lightning impulse withstand voltage (vacuum fracture, interphase, phase to earth / isolation fracture)	kV	75/85
4s rated short-time withstand current	kA	31.5
Rated peak withstand current	kA	80
Rated short-circuit closing current	kA	80
Mechanical life	Times	10000
Allowable cumulative thickness wear in contact	mm	2
Opening and closing operating torque	N·m	≤200

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 pole 14. Main axle 15. Layshaft 16. Adjusting yoke 17. Spring operating mechanism