ZW20X-12 medium voltage vacuum circuit breaker
ZW20X-12 Series Outdoor HV vacuum breaker (hereinafter referred to as breaker) for the rated voltage of 12KVf three-phase AC 50Hz outdoor distribution equipment. It uses a vacuum interrupter and SF6 gas as insulating medium, the ZW20-12-type column vacuum breaker improved products. Box with the introduction of Japan's Toshiba Corp. VSP5 gas sealed, explosion-proof, insulation technology, into the outlet duct has also been sealed divergence one can improve the overall sealing performance, not the internal filling of SF6 gas leakage from the external environment impact, the spring operating mechanism for a small design and optimize the reliability and stability, the use of direct-acting chain primary drive and multi-level release system, operating reliability and stability operations than domestic institutions to enhance the traditional spring several times, main circuit contact between the shaft and sleeve with a bracelet style sheets adduction structure, the main circuit of the contact resistance, low temperature rise. So ZW20X-12 type outdoor vacuum circuit breaker is a kind of surgery on the maintenance-free product, is the circuit breaker in the column to share.
ZW20X-12 than the ZW20-12 also increased the over-current protection, institutions spring energy storage instructions, and dirty air outlet is allowed to develop with the second electrical connection, easy and intelligent controller combination. Excellent electrical and institutional performance, the column ZW20X-12 type outdoor vacuum circuit breaker is widely used. Mainly used for breaking, closing 10KV power system control facilities, with excellent function of coincidence, to meet the distribution automation system.
Environmental conditions:
1.Ambient temperature: not higher than +40 °C, not less than -40°C
2. Altitude: not exceed 2000m.
3. Relative humidity: daily average of not more than 95%, month average of not more than 90%.
saturated vapor pressure daily average of not more than 2.2 × 103MPa, month average not more than 1.8 × 103MPa.
4. Earthquake intensity: not more than eight.
5. No fire, explosion hazard, serious filthy, chemical corrosion, as well as places of intense vibration.

| Items | Unit | Data |
| Rated voltage | KV | 12 |
| Rated frequency | Hz | 50 |
| Rated current | A | 630, 100 |
| Rated short circuit breaking current | KA | 12.5. 16, 20, 25 |
| Rated peak withstand current (peak) | KA | 31.5,40,50,63 |
| Rated short time withstand current (4s) | KA | 12.5,16, 20, 25 |
| Rated short-circuit current (peak) | KA | 31.5,40, 50. 63 |
| Mechanical life | Times | 10000 |
| Rated breaking current number of Y | Times | 10000 |
| Rated short-circuit current breaking times | Times | 30 |
| Frequency voltage (1 min): white, on the ground / fracture | KV | 42 |
| Lightning impulse withstand voltage (peak) and white, contrast, circuit | KV | 75 |
| Secondary circuit 1 min power frequency withstand | KV | 2 |
| Net weight | Kg | 140 |