ZN73A-12 series permanent magnet indoor high-voltage vacuum circuit breaker is indoor switchgear with 50Hz three-phase ACand 12kV rated voltage. Equipped with the permanent magnetic operating mechanism developed by our company, it can beused for control and protection of electric utilities in industrial and mining enterprises, power stations and transformersubstations. The product has the characteristics of very high reliability and long life and so on, especially applicable to places
1. Ambient temperature should be lower than +40℃and higher than -25 ;
2. Height above sea level should be lower than 1000, plateau type should be lower than 3000m;
3. The daily average relative air humidity should be lower than 95%, the monthly average humidity lower than 90%, the daily
average value of saturated vapor pressure should be lower than 2.2×10 -3 Mpa , the monthly average value lower than 1.8 x 10
-3MPa, and it may generate condensation when the temperature drops sharply in high humidity period;
4. Seismic intensity should be lower than Grade 8;
5. Place where there is no fire, explosion hazard, heavy pollution, chemical corrosion and violent vibration.