Summary
   ZW20-12/630 Outdoor AC high voltage boundary vacuum circuit breaker is rated voltage 12KV，Three phase AC 50Hz outdoor power distribution equipment is a user boundary switch。It is mainly composed of zw20-12 vacuum circuit breaker body, fault detection controller and external voltage transformer, which are electrically connected through aviation socket and outdoor sealed control cable, with fault detection function, protection control function and communication function, it can reliably judge and detect milliampere level zero sequence current and phase to phase short circuit fault current within and outside the boundary, so as to realize automatic removal of single-phase ground fault and phase to phase short circuit fault。
   Zw20-12 / 630 is vacuum arc extinguishing and SF6 gas insulation is adopted，The gas seal, explosion-proof and insulation structure technology of vsp5 made by Toshiba company of Japan is adopted for the box，The sealing performance of the in &out conduit has also been improved. The overall sealing performance is excellent. The SF6 gas filled inside is not leaked and is not affected by the external environment，the spring operating mechanism is miniaturized and its performance is optimized. Its reliability and stability are significantly improved compared with the traditional spring mechanism in China，The contact between the shaft and the sleeve of the main circuit adopts the structure of internal and external tension type watch chain. The contact resistance of the main circuit is small and the temperature rise is low。Reliable product performance is a real maintenance free product。
Characteristic

1. It’s ideal equipment for the transformation of urban and rural power grid，The vacuum circuit breaker and the intelligent controller can form auto reclosing, realize the reclosing function, as well as remote control, telemetry, remote signaling and remote adjustment。
2. Flexible and convenient operation, this product is electric energy storage，Electric opening and closing, with manual energy storage, manual opening and closing, and remote control operation。
3. Excellent breaking performance, breaking short circuit current 20KA (25kA) up to 30 times。
4. The operation power is small and the reliability is high. The newly designed small electric spring mechanism reduces the operation power of the number of parts (about 30W) to the lowest level。
5. It is maintenance free, and the main circuit, secondary components and operating mechanism of the circuit breaker are sealed in SF6 gas (zero gauge pressure), which is not affected by the external environment。
6. Reliable sealing performance, adopting mature sealing mechanism technology, reliable sealing performance。
7. The unique way of incoming and outgoing line adopts silicon rubber sleeve, which makes the insulation distance between terminals abundant and the external insulation property excellent。
8. It is safe to use. The explosion-proof device is installed on the top of the box. Even if there is an unexpected internal failure, there will be no leakage of high temperature gas or splashes.

ZW20-12  technology reference data