ERFA-12 series of Indoor High Voltage Vacuum Circuit Breaker with
embedded poles is three phase A.C.50Hz indoor power distribution
equipment with the rated voltage of 24kV.It's used for protecting
and controlling the electrical equipment in the fileds of
industry&mining enterprise,power plants and substation.
The main conductive circuit of this type vacuum circuit breaker
with spring mechanism is embedded pole,that can greatly improve the
reliability of insulation,mechanical and breaking performance,and
really realize the free-maintance and longer
This type Vacuum Circuit Breaker conforms to national standards and
the stipulations of IEC standard.The capability reaches grade of
The products is used for many kinds of switchgear like
KYN28-24(GZS1)and can be fixed installation.
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