Product Overview
The FN7-12R/630 indoor high-voltage load switch, with rated voltage 12 kV and rated current 630 A, is suitable for three-phase AC power systems of 50 Hz, 12 kV, for breaking load current and making short-circuit current. This load switch is widely applied in industrial and mining enterprises as well as urban and rural distribution networks.
Product features: This product is a load switch-fuse combination apparatus (the 'R' in the model indicates an integrated current-limiting high-voltage fuse). Normal load current is switched by the load switch, while short-circuit faults are interrupted by the fuse, providing combined protection and suitable for primary circuits in 12 kV indoor distribution networks requiring short-circuit protection. The FN7-12R/630 load switch has a rated current of 630 A, a 4 s rated short-time withstand current of 20 kA and a rated peak withstand current of 50 kA. As a switch-fuse combination apparatus, the FN7-12R/630 is rated 12 kV with a 1 min power-frequency withstand voltage of 42 kV and an impulse withstand voltage of 75 kV.
Product Images
Type Designation
Type code format: F N 7 12 D - X L / R A - F 630
| F | Load switch |
| N | Indoor |
| 7 | Design serial no. |
| 12 | Rated voltage (kV) |
| D | Earthing switch |
| X | Earthing switch position (incoming end: S; outgoing end: X) |
| L | Interlocking device (with: L; without: blank) |
| R | With fuse |
| A | Striker fuse (with: A; without: blank) |
| F | Electric opening device (with: F; without: blank) |
| 630 | Rated current (400, 630A) |
Normal Service Conditions
- Ambient air temperature: upper limit +40°C, lower limit -10°C for general areas and -25°C for severe cold areas;
- Altitude not exceeding 1000m;
- Relative humidity: daily average not exceeding 95%, monthly average not exceeding 90%;
- The surrounding air shall not be significantly polluted by corrosive or flammable gases and water vapor;
- No frequent severe vibration.
Main Technical Parameters
| Item | Parameter (400A) | Parameter (630A) |
|---|---|---|
| Rated voltage (kV) | 12 | 12 |
| Rated insulation level, 1 min power-frequency withstand at 50 Hz (kV) | 42 phase-to-phase/phase-to-ground; 48 across isolating gap | 42 phase-to-phase/phase-to-ground; 48 across isolating gap |
| 1.2/5 μs impulse withstand voltage (kV) | 75 phase-to-phase/phase-to-ground; 85 across isolating gap | 75 phase-to-phase/phase-to-ground; 85 across isolating gap |
| Rated current (A) | 400 | 630 |
| Rated short-time withstand current (kA, 4 s) | 12.5 | 20 |
| Making capacity of load switch and earthing switch (kA, peak) | 31.5 | 50 |
| Rated peak withstand current (kA) | 31.5 | 50 |
Outline and Mounting Dimensions
Related Products
- FN5-12R/630A indoor high-voltage load switch
- FN5-12/630A indoor high-voltage load switch
- FN5-12RL/630A indoor high-voltage load switch
- FN7-12/630 indoor high-voltage load switch
- FN7-12RL/630A indoor high-voltage load switch
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