summary
        ZN28-12 series vacuum circuit breaker is a high-voltage indoor switchgear with rated voltage of 12kV and three-phase AC 50Hz. The product conforms to GB  1984-89 standard. The overall structure of the product includes two forms: integrated installation of switch body and operating mechanism, integrated installation of switch body and operating mechanism, and separate installation of switch body and operating mechanism. The integrated structure is ZN28-12 basic type; the split structure is ZN28A-12 type, which is suitable for various fixed switch cabinets, such as gg1a (z), xgn2a10 (z), etc.
        The product can be equipped with CD17, CD10 DC electromagnetic operating mechanism and CT17, CT19 spring energy storage operating mechanism.

Environmental conditions of use
a. The ambient temperature shall not be higher than + 40 ℃ and shall not be lower than - 10 ℃ (it is allowed to store and transport at - 30 ℃);
b. The altitude is not more than 1000m;
c. The daily average value of air relative temperature is not more than 95%, the monthly average value is not more than 90%, the daily average value of saturated steam pressure is not more than 2.2 × 10-3mpa, and the monthly average value is not more than 1.8 × 10-3mpa;
d. The seismic crack degree shall not exceed 8 degrees;
e. No place with fire, explosion, serious pollution, chemical corrosion and severe vibration.

Model and meaning



Main technical parameters


Outline and installation dimension