
This series of high voltage magnetic drive vacuum circuit breakers is equipped with high quality vacuum arc chutes, as well as advanced and reliable bistable magnetic drive and intelligent controller.
This series of high voltage magnetic drive vacuum circuit breakers is equipped with high quality vacuum arc chutes, as well as advanced and reliable bistable magnetic drive and intelligent controller. The equipment is equipped with a false switching protection function, low switch-on and switch-off current, and the ability to shut down in case of power loss. The switches are characterized by high speed, large stroke and contact gap, low contact jump, stable phase synchronism and excellent breaking capacity. The insulating parts are made of cast epoxy compound, the frame is made of metal, the design is rational, aesthetic and stable. Particularly suitable for safe and reliable switching of high-power capacitor banks.
| Parameter | ZN3A-630/12 | ZN3A-800/12 | ZN3A-1000/12 | ZN3A-1250/12 |
| Rated voltage of the main circuit, kV | 12 | 12 | 12 | 12 |
| Rated current of the main circuit, A | 630 | 800 | 1000 | 1250 |
| Rated frequency, Hz | 50 | 50 | 50 | 50 |
| Rated short-circuit breaking current, kA | 12.5/16/20 | 12.5/16/20 | 12.5/16/20 | 12.5/16/20 |
| Rated switching current during short circuit, kA | 31.5 | 31.5 | 31.5 | 31.5 |
| Rated short-term withstand current, kA | 12.5/16/20 | 12.5/16/20 | 12.5/16/20 | 12.5/16/20 |
| Duration of short circuit current, s | 3 | 3 | 3 | 3 |
| Number of short circuit breaking operations | 25 | 25 | 25 | 25 |
| Mechanical wear resistance of the mechanism with permanent magnets, 10 thousand cycles | 10 | 10 | 10 | 10 |
| Power frequency test voltage of the main circuit (with open contacts), kV | 42 | 42 | 42 | 42 |
| Power frequency test voltage (between phases / phase-ground), kV | 42 | 42 | 42 | 42 |
| Rated lightning impulse voltage, kV | 75 | 75 | 75 | 75 |
| Contact pressure, N | >200 | >200 | >200 | >200 |
| Gap between contacts, mm | 9±1 | 9±1 | 9±1 | 9±1 |
| Contact overtravel, mm | 2±0.5 | 2±0.5 | 2±0.5 | 2±0.5 |
| Main circuit contact resistance, µOhm | ≤100 | ≤80 | ≤60 | ≤50 |