Outdoor high voltage AC isolation switch (hereinafter simply "isolation switch"), is a single-phase hook rod operated isolation switch, the knife has a self-locking device. The isolation switch is suitable for the isolation of 12kV and 15kV overhead lines, opening and closing operation under no load, widely used with circuit breakers or load switches and provide safe visible breaks for the line.
Altitude: no more than 1000m. If the altitude is higher than 1000m, the rated insulation level shall be corrected accordingly.
Ambient temperature: upper limit + 45 0C, lower limit - 40 0C, average temperature of the hottest month 30 0C, maximum daily temperature difference 25K.
Solar radiation intensity (outdoor): 0.1W/cm2
Wind speed / pressure (outdoor): 34m/s / 700Pa
Pollution level: e-level
Icing thickness: not more than 20mm
Humidity: average daily relative humidity, not more than 95%, average monthly relative humidity not more than 80%
Earthquake resistance: horizontal acceleration 0.3m/2, vertical acceleration 0.15m/s2
Safety factor: sinusoidal resonance three cycle wave, safety factor above 1.67
| Name | Unit | Data | |
| Rated frequency | Hz | 50 | |
| Rated voltage | kV | 12 | |
| Rated current | A | 630(1250) | |
| Rated short-time withstand current and duration | kA/s | 20(25)/4 | |
| Rated peak withstand current | kA | 50(63) | |
| Rated short-time power frequency withstand voltage | Phase to phase,to earth(dry) | kV/min | 42/1 |
| Open contact(dry) | 48/1 | ||
| Phase to phase,to earth(wet) | 30/1 | ||
| Open contact(wet) | 36/1 | ||
| Rated lightning impulse withstand voltage | Phase to phase,to earth | kV | 75 |
| Open contact | 85 | ||
| Loop resistance | μΩ | ≤80 | |
| Mechanical life | Times | 3000 | |
| Pollution grade | e Grade | ||
| creep age distance | mm | ≥372 | |
