With impact structure, aesthetic appearance,reliable interlock and high insulting level, easy maintenance and operation as well as reliable performance.
In the spring storage operation mechanism, CO speed is free from the influence of the manpower. For the arc-extinguish, electric arc- extinguish inside the insulating cover, the free gas occurs at sparking do not cause descend of insulating level between phases and phase to earth. The insulation cover clapboard separates electrified part thus boost protection grade of ring main unit. The copper-tungsten contact and main contact brings along reliable conductivity and long life.
| No. | Item | Unit | FKN12-12D/630 | FKRN12-12D/T125 |
| 1 | Rated voltage | kV | 12 |
|
| 2 | Rated power frequency | Hz | 50 |
|
| 3 | Rated current | A | 630 | 100 |
| 4 | Rated lightning impluse withstand voltage | kV | To ground and interphase, isolation break |
|
| 5 | Power frequency withstand voltage | kV | To ground and interphase, isolation break | |
| 6 | Rated short-time withstand current | kA | 20(4s) | |
| 7 | Rated peak withstand current | kA | 50 | |
| 8 | Rated close current(peak) | kA | 50 | 50 |
| 9 | Rated short circuit breaking current(expected value) | kA | 31.5 | |
| 10 | Max.critical breaking current | A2S | Follow fuse characteristic curve | |
| 11 | Min. breaking current | kA | Follow fuse characteristic curve | |
| 12 | Rated transfer current | kA | 1.5 | |
| 13 | Max. breaking current(reference value) | kA | 1.8 | |
| 14 | Braking no-load transformer capcity | kva | 1250 | |
| 15 | Rated cable charging current | A | 10 | |
| 16 | Rated active load current breaking times | times | ＞100 | |
| 17 | Switch-off time of rated active load current | s | 20(2s) | ＞0.06 |
| 18 | Earthing switch thermal current | kA | 50 | 20(2s) |
| 19 | Earthing switch steady current(peak) | kA | 50 | |
| 20 | Motor operating power voltage | V | 100, 220 AC, DC |
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