| Customization: | Available |
|---|---|
| Type: | High-voltage |
| Installation: | Indoor High-voltage |
|
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The FN7-12 Indoor High Voltage Load Switch-Fuse Combination Unit is a compact, reliable switching device designed for indoor medium voltage switchgear systems, particularly suitable for AC 50Hz, 12kV power distribution networks. It integrates the function of a load break switch and current-limiting fuse, offering superior protection for transformers and other electrical equipment.
The device adopts an advanced arc-extinguishing structure and fast operating mechanism, ensuring safe breaking under load conditions and effective fault current interruption. It is ideal for use in ring main units (RMU) and compact substations.
| Rated voltage(kV) | 12 | ||
| Rated insulation level voltage |
Power frequency 50Hz withstand voltage 1min (kV)
1.2/5us impulse withstand voltage (kV) |
Phase-to-phase,
Phase-to-phase, |
Isolation break 48
Isolation break 85 |
| Rated current (A) | 400 | 630 | |
| Rated short-time withstand current (kA, 4S) | 12.5 | 20 | |
| Rated peak withstand current (kA) | 31.5 | 50 | |
| Load switch, earthing switch, closing capacity (kA, peak) | 31.5 | 50 | |
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