| Brand | ROCKWILL |
| Model NO. | Outdoor Air Load Break Switch for Distribution Networks-12kV to 40.5kV |
| Rated voltage | 40.5kV |
| Series | FKW |
Rockwill FKW18 series outdoor AC medium voltage load break switch, designed for 12kV to 40.5kV three-phase power distribution systems. Composed of disconnect blade, arc extinguishing chamber, and operating mechanism, it features simple structure, reliable arc extinguishing performance, and stable operation. Suitable for pole-mounted and ground-mounted installation in urban and rural distribution networks.
| No. | Item | Unit | 12kV | 24kV | 36kV | 40.5kV |
|---|---|---|---|---|---|---|
| 1 | Rated voltage | kV | 12 | 24 | 36 | 40.5 |
| 2 | Rated frequency | Hz | 50/60 | |||
| 3 | Rated current | A | 630 | |||
| 4 | 5% rated active load breaking current | A | 31.5 | |||
| 5 | Rated cable charging breaking current | A | 10 | |||
| 6 | 1min power frequency withstand voltage | kV | 42/48 | 52/65 | 75/95 | 75/95 |
| 7 | Lightning impulse withstand voltage | kV | 75/85 | 125/145 | 185/215 | 185/215 |
| 8 | Rated short-time withstand current (thermal) | kA | 20 | |||
| 9 | Rated short-circuit duration | s | 1 | |||
| 10 | Rated peak withstand current (dynamic) | kA | 50 | |||
| 11 | Rated short-circuit making current | kA | 50 | |||
| 12 | Mechanical life | times | 2000 | |||
| Parameter | Condition |
|---|---|
| Ambient temperature (outdoor) | −25°C to +40°C |
| 24h average temperature | ≤35°C |
| Altitude | ≤1000 m |
| Relative humidity (daily avg) | ≤95% |
| Relative humidity (monthly avg) | ≤90% |
| Water vapor pressure (daily avg) | ≤2.2 kPa |
| Water vapor pressure (monthly avg) | ≤1.8 kPa |
| Solar radiation | ≤1000 W/m² |
| Pollution level | Class II (min) |
| Installation | Outdoor, pole-mounted or ground-mounted |
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