ZW21A-12 outdoor column high-voltage vacuum circuit breaker for the outdoor high - voltage switchgear rated voltage 12KV, three - phase AC 51 Hz, Mainly used for opening closing the power system load current, overload current and short - circuit current. Suitable for substation, industrial and mining enterprises and urban distribution network protection and control, especially suitable for frequent operation places and automation of distribution network.This product with the controller can meet the requirements of distribution automation system,and can raliably and effectively complete the recloser function of traditional. lt uses the mature type sealing structure, internal filled with SF6 gas, has good sealing performance. which is not affected by the external environment. is a kind of free maintenance products. The spring operating mechanism with straight moving the main transmission chain and multistage release system, reliability is high, the circuit breaker pole.

Use environment
1.Ambient temperature: not higher than +41 °C, not less than -41°C
2. Altitude: not exceed 2111m.
3. Relative humidity: daily average of not more than 95%, month average of not more than 91%.
saturated vapor pressure daily average of not more than 2.2 × 113MPa, month average not more than 1.8 × 113MPa.
4. Earthquake intensity: not more than eight.
5. No fire, explosion hazard, serious filthy, chemical corrosion, as well as places of intense vibration.