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The switch disconnectors series FN12 are increasingly adopted in MV installations, owing to their superior interrupting features and to their capability to withstand the short-circuit currents which occur mainly as consequences of faults in distribution networks. The versions combined with HRC fuses are particularly suitable for the protection of distribution transformers up to 1250 kVA The use of FN12, designed for installation in compartmented switchboards have the following advantages: -Full segregation between the busbar compartment and the cable compartment, with switch disconnector in both "closed" and "open" position. -The moving contact, of the sliding vertical type, can be easily checked and cleaned with live bus-bars and earthing switch (ES) closed. -No adjustment is needed in the tripping mechanism of the switch fuse combination and of the ES: they are built together in a single unit, which is adjusted and checked during assembly in the factory, before the final test.
Technical Information
Technical Specification |
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Rated voltage | kV | 12 | 24 | 36 |
Rated current | A | 630 | 630 | 630 |
Rated power frequency | Hz | 50/60 | 50/60 | 50/60 |
Short circuit making capacity | kA Peak. | 67 | 50 | 50 |
Peak withstand current | kA Peak. | 82 | 82 | 66 |
Short time current | kA eff. |
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1Sec. |
| 31.5 | 31.5 |
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2Sec. |
| 25 | 25 | 25 |
3Sec. |
| 20 | 16 |
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Max. breaking capacity in co-operation with fuses IEC 62271-105(IEC 420 1990-11) | A | 1600 | 900 | 300 |
Max. fuse current(XRNT Fuse) | A | 125 | 80 | 40 |
Power frequency withstand voltage 50Hz 1 min,: |
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- To earth and between poles | kV | 42 | 55 | 95 |
- Across isolating distance | kV | 45 | 70 | 120 |
Impulse withstand voltage 1.2/50μ s: |
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- To earth and between poles | kV | 75 | 125 | 190 |
- Across isolating distance | kV | 85 | 145 | 220 |
Mechanism Endurance | cycles | 2000 | 2000 | 2000 |
Overall and installation dimensions
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+86 577 61666 016
Mailbox：wzxikai@wzxikai.com
Tel：+86 577 61666 016
Fax：+86 577 61666 010
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