● ZW20-12 outdoor AC MV vacuum boundary circuit breaker (hereinafter referred to as the boundary circuit breaker) is one of our new products. Boundary circuit breaker is a multifunctional intelligent device with the function of vacuum breaker, vacuum load switch, recloser, sectionalizer four switches. The main configuration consists of vacuum breaker, CH-40 controller, external voltage transformer (Note: distribution automation line ring network available in bilateral PT) three parts. Products are widely used in 10kV, 13kV city, rural power grid space ring network for disconnecting switch, contact switch, automatic switch device which can implement the ring deployment line load. It can be used as boundary switch (commonly known as watchdog) in the branch line of power supply, used as reclosers and sectionalizers in feed overhead distribution network. A boundary circuit breaker is designed with remote management mode, protection and control functions, and communication functions. Reliable detection device with mA level zero sequence current and phase to phase short circuit current can achieve automatic troubleshooting of single-phase grounding faults and phase to phase short circuit faults.
● The main switch adopts vacuum arc, and the insulation adopts SF6 and N2 mixed gas. The case introduces the gas sealing, explosion-proof, and insulation system technologies of Japan, Germany, and France, and the overall sealing performance is excellent. The interior is filled with SF6, N2 mixed gas, no leakage, and not affected by the external environment. The spring operating mechanism adopts a miniaturized and performance-optimized design, and its action reliability is much higher than that of the traditional spring mechanism.
● Standard: IEC 62271-100.

Selection

Operating conditions

1. Altitude≤2000 meters
2. The environment temperature: -30℃ ~+55℃ outdoor; the highest annual average temperature 20 ℃, the highest daily average temperature 30 ℃;
3. Relative humidity: 95% (25℃)
4. Seismic capacity: horizontal ground acceleration 0.3g, vertical ground acceleration 0.15g, at the same time duration of three sine waves, a safety factor of 1.67
5. Earthquake intensity: 7 degrees
6. The maximum daily temperature difference: 25 ℃
7. The intensity of sunshine (wind speed 0.5m/s): 0.1W/cm²
8. The maximum wind speed: 34m/s
9. The maximum ice thickness: 10mm
10.Installation position: outdoor, the 10kV overheadline responsibility demarcation point
11.Grounding: neutral non grounding, arc suppression coil grounding and low resistance grounding.

Technical data

 Overall and mounting dimensions(mm)