FN7-12 AC high-voltage load switch is a new type of gas-producing indoor high-voltage load switch. It is suitable for three-phase AC power systems with AC 50Hz and rated voltage of 12kV. It is used for breaking load current and closing short-circuit current.
FN7(C)-12 series high-voltage load switch and fuse combination are based on FN7-12 series high-voltage load switch, adding side operating mechanism, which makes the installation more simple and convenient, and can meet the different requirements of users
| Type | Model | DS | DX | L | R | RA | F |
| Earthing switch at input terminal | Earthing switch at output terminal | Interlock device | Fuse | Impact release | Power closing device | ||
| No release | FN7-12 | – | – | – | – | – | – |
| FN7-12DSL | △ | – | △ | – | – | – | |
| FN7-12DXL | – | △ | △ | – | – | – | |
| FN7-12R | – | – | – | △ | – | – | |
| FN7-12DSLR | △ | – | △ | △ | – | – | |
| FN7-12DXLR | – | △ | △ | △ | – | – | |
| With impact release | FN7-12RAF | – | – | – | – | △ | △ |
| FN7-12DSLRAF | △ | – | △ | – | △ | △ | |
| FN7-12DXLRAF | – | △ | △ | – | △ | △ |
Note: (-)without (△)with
| Item | Unit | Data | |
| Rated Voltage | KV | 12 | |
| Maximum voltage | KV | 12 | |
| Rated current | A | 400 | 630 |
| 1min frequency withstand voltage. | KV | 42/48 | |
| 4S thermally stable rated current (RMS) | KA | 12.5 | 50 |
| Dynamic stabilization current(peak) | KA | 31.5 | 50 |
| Short circuit closing current | KA | 31.5 | 50 |
| Rated opening current | A | 400 | 630 |
| Rated transfer current | A | 1000 | |
1. The upper limit of surrounding air temperature: +40℃, the lower limit: -25℃.
2. Altitude not exceeding 1000m.
3. Relative humidity: daily average not more than 95%, monthly average not more than 90%.
4. Earthquake intensity not exceeding 8 degrees.
5. No fire, explosion hazard, chemical corrosion and violent vibration in the place.
6. Filtration level: Class II.
7. The surrounding air should be free from obvious pollution such as corrosive or combustible gases and water vapour.
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