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
Use of environmental conditions
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.
| 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 | |
Outline Dimension Drawing
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