国产精品无码久久久久久久久久_欧美乱妇欲仙欲死视频_国产精品美女在线福到_日本男女啪啪_国产精品久久久久成人_国产午夜福利精品久久

General

FN7-12D type indoor load break switch is suitable for operating in the three-phase AC50Hz, rated voltage 12KV system, to break the power source and make short circuit current, the fuse switch can break the current up to rated short circuit level, as protective equipment.

Normal service conditions

Ambient air temperature:  -25℃~+40℃, 

Altitude: ≤ 1000m;

Humidity:

Daily average value of relative humidity: ≤95%

Monthly average value of relative humidity: ≤90%

The ambient air is not significantly polluted by dust, smoke, corrosive and/or flammable gases, vapours or salt.