ZFN21-12D/T630-20, ZFN21-12DR/T125-31.5 high-voltage vacuum load switch and combination electric appliance are used in three-phase AC 10KV, 50Hz power distribution system. The utility model has the advantages of compact structure, small volume, light weight, long service life, strong closing and breaking ability, safety and reliability, and the like.

Used in conjunction with fuses, it can replace the cost-effective circuit breakers, and its operation and maintenance are simple and convenient.

The altitude does not exceed 1000m;

Ambient temperature: -25 ° C ~ +40 ° C;

Relative humidity: the daily average is not more than 95%, and the monthly average is not more than 90%;

A place free of conductive dust, corrosive gases and water vapor;

A place free from fire and explosion hazards;

There is no place with severe vibration and inclination less than 3 degrees.