FN7-24 is used in triphase AC power network of AC 50Hz, rated voltage 24KV for breaking load current and controlling short-circuit current.
FN7(C)-24 type H.V. load switch and fuse box is based on the FN7-24 series H.V. load switch with operating mechanism, making the installation more simpler. It meets orders needs.
Normal service condition
1. The ambient air temperature: MAX.: +40°C, Min.: -10°C.
2. The altitude does not exceed 1000m.
3. The relatire humidity of air daily average ≤90%, monthly average ≤ 95%.
4. The ambient air should not be obviously polluted by corrosivity or the flammability gas and steam. etc.
5. The working situation without frequent violent.
Specification
Model | FN7-12 | FN7-24 | |
Rated Voltage | 12KV | 24KV | |
Rated Frequency | 50/60Hz | 50/60Hz | |
Rated Current | 630A | 630A | |
Rated Short Circuit Closing Current | 50KA | 50KA | |
Rated Peak Withstand Current (Dynamic Steady Current) | 50KA | 50KA | |
Rated Short-Time Withstand Current(Thermally Stable Current) | 1s | 31.5KA | 25KA |
2s | 20KA | 25KA | |
3s | 18KA | 16KA | |
Max. breaking capcity in co-operation with fuse | 1600A | 900A | |
Max.fuse current | 200A | 200A | |
1 min Power Frequency Withstand Voltage(Effective Value)Ground and Phase | to earth and between poles | 42KV | 65KV |
across isolating distance | 48KV | 79KV | |
Lightning Impulse Withstand Voltage(Peak) 1.2/50 μs | to earth and between poles | 75KV | 125KV |
across isolating distance | 85KV | 145KV |
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