Application Scope

The ZN28A-12 series indoor high-voltage vacuum circuit breakers are indoor installations for three-phase AC 50Hz with a rated voltage of 12kV. They are primarily installed in mobile and fixed switchgear cabinets, used for power generation and electrical equipment protection and control in industrial and mining enterprises and substation applications, and are suitable for frequently operated environments. The circuit breakers are designed, manufactured, and tested according to GB1984-2003 and related standards.

Application Environment

●Ambient temperature not exceeding +40°C, not below -10°C (storage and transportation allowed at -30°C)

● Altitude not exceeding 1000m;

●The daily average relative humidity does not exceed 95%, and the monthly average does not exceed 90%. The daily average saturated vapor pressure does not exceed 2.2 x 10^-3 MPa, and the monthly average does not exceed 1.8 x 10^-3 MPa.

● Earthquake intensity not exceeding 8 degrees.

No fire, explosion, severe contamination, chemical corrosion, or severe vibration areas.