Product Overview
The FN7-12/630 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 standard indoor high-voltage load switch (without fuse). It can break normal operating current and part of the overload current, but has no short-circuit breaking capability by itself and must be used together with upstream protective devices. It is suitable for circuits in 12 kV indoor distribution networks requiring load operation only. The FN7-12/630 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. Without a fuse, the FN7-12/630 indoor load switch breaks normal load current, closed-loop current and cable charging current in 12 kV systems.
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
- FN7-12R/630 indoor high-voltage load switch
- FN7-12RL/630A indoor high-voltage load switch
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