Indoor High-Voltage Load Switch-Fuse Combo (FKN12-12D)
The FKN12-12D pressure-operated load switch and the FKR12A-12D series pressure-operated load switch-fuse combination devices are suitable for three-phase distribution systems with a voltage of 10kv(12 kv) or below. They are used for the control and protection of electrical equipment such as transformers, cables, and overhead lines. They are particularly suitable for terminal substations and box-type substations in urban and rural networks. They are also applicable for the control and protection of ring networks and dual power supply units. The FKN12-12D series pressure-operated load switch can switch load currents and overload currents. The FKR12A-12D series pressure-operated load switch-fuse combination device can switch load currents, overload currents, and short-circuit currents.
Suitable for three-phase distribution systems with a voltage of 10kv(12 kV) or below, used for the control and protection of electrical equipment such as transformers, cables, and overhead lines; particularly suitable for terminal substations and box-type substations in urban and rural networks.
| serial number | Tech. parameters | unit | FKN12-12D/630-20 | FKN12-12R.D/125-31.5 |
| 1 | Rated voltage | KV | 12 | |
| 2 | Rated frequency | HZ | 50 | |
| 3 | Rated current | A | 630 | 125 |
| 4 | Lightning impulse withstand voltage | KV |
75 to the ground and phase, 85 for isolation |
|
| 5 | 1min Power-frequency withstand voltage | KV | Ground and phase 42. Isolation 48 | |
| 6 | Rated thermal stability current | KA | 20(4s) | |
| 7 | Rated dynamic stability current | KA | 50 | |
| 8 | Rated closing current (peak) | KA | 50 | |
| 9 | Rated short-circuit breaking current | KA | 20 | 31.5 |
| 10 | Rated transfer current | KA | 1.5 | |
| 11 | Maximum Breaking Current (Reference Value) | KA | 1.8 | |
| 12 | Capacity of no-load transformer for breaking | Kva | 1250 | |
| 13 | Rated charging current | A | 10 | |
| 14 | Rated breaking times of active load breaking current | times | >100 | |
| 15 | Rated breaking times of load breaking current activated by impactor | S | >0.06 | |
| 16 | Earth switch rated thermal stability current | KA | 20(2s) | |
| 17 | Earth switch rated thermal stability current (Peak value) | KA | 50 | 50 |
| 18 | Motor operating power supply voltage | V | AC/DC 220、110 | |
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