ZN73A-12series permanent magnet-type indoor high voltage vacuum
circuit breaker is a three-phase AC 50Hz,rated voltage of 12kV
Our company with its own research and development of permanent
magnetic actuator for industrial and mining enterprises, power
generation and substation facilities as electrical control and
protection purposes. The product has high reliability and long life
characteristics, especially suitable for frequent operation,
repeatedly breaking conditions,such as short-circuit current of the
Applying ambient conditions
1. Ambient temperature:-15ºC~+40ºC.
2. Ambient humidity:the average humidity of a day should be no more
than 95%;the average humidity of a month should be no more than
3. Earthquake intensity:not exceed 8 degrees.
4. Saturated vapour pressure:the average pressure of a day should
be no more than 2.2kPa;the average pressure of a month should be no
more than 1.8kPa.
5. The height above sea level:1000m(besides the special
6. It should be installed in the places without
fire,explosion,serious filth,chemical erosion and violent