Overview
The FKN12-12/FKRN12-12D indoor high-voltage puffer-type load switch is suitable for three-phase high-voltage switchgear of 12 kV and below, serving as control and protection for power equipment such as transformers, cables and overhead lines. The FKN12/FKRN12-12D load switch is especially suitable for terminal substations and prefabricated substations in urban and rural distribution networks. It is also applicable to the control and protection of ring main units and double radial supply units, and this load switch offers oil-free, maintenance-friendly operation. The FKN12-12 load switch provides a 4 s rated short-time withstand current of 20 kA, a rated short-circuit making current of 50 kA and a rated active load breaking current of 630 A.
Type Designation
Normal Service Environment
Ambient air temperature: upper limit +40°C;
Lower limit -25°C (storage and transportation allowed at -30°C); the 24-hour average shall not exceed +35°C;
Altitude: not exceeding 1000m; relative air humidity: daily average not exceeding 95%, monthly average not exceeding 90%;
Seismic intensity: not exceeding grade 8
The surrounding air shall not be significantly polluted by corrosive or flammable gases, water vapor, etc.;
◇ No frequent severe vibration; ◇ Pollution level: Class II.
Outline and Mounting Dimensions
Dimensions (A H C D E F K J L M N P R s T U V W Z) Weight
| Model Unit | A | H | C | D | E | F | K | J | L | M | N | P | R | T | U | W | Z | Weight | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| FKRN12-A-12D | 390 | 840 | 600 | 210 | 642 | 270 | 67 | 50 | 170 | 287 | 171 | 368 | 16 | 405 | 150 | 94 | 105 | 868 | 180 | 70 kg |
| No. | Item | Unit | Data | ||
|---|---|---|---|---|---|
| FKN12-12D | FKRN12-12D | ||||
| 1 | Rated voltage | kV | 12 | ||
| 2 | Rated frequency | Hz | 50 | ||
| 3 | Rated current | A | |||
| 4 | Lightning impulse withstand voltage | kV | 42 to ground/phase-to-phase, 48 across isolating gap | ||
| 5 | 1 min power-frequency withstand voltage | kV | 75 to ground/phase-to-phase, 85 across isolating gap | ||
| 6 | Rated short-time withstand current | Load switch | kA | 20 | |
| Earthing switch | kA | 20 | |||
| 7 | Rated short-circuit duration | Load switch | s | 4 | |
| Earthing switch | s | 2 | |||
| 8 | Rated short-circuit making current (peak) | 50 | |||
| 9 | Rated breaking current | Active load breaking current | A | 630 | |
| Closed-loop breaking current | A | 630 | |||
| 5% active load breaking current | A | 31.5 | |||
| Cable charging current | A | 10 | |||
| No-load transformer breaking capacity | kVA | 1250 | |||
| 10 | Rated short-circuit breaking current (current-limiting fuse) | kA | 31.5 | ||
| 11 | Rated transfer current | A | 1200 | ||
| 12 | Mechanical endurance | times | 2000 | 2000 | |
| 13 | Striker output energy | J | J | 1+0.5 | |
Related Products
Load switches of the same series and other types available for selection:
