91亚洲激情|国产主播一区二区三区|久久人妻少妇嫩草av无码专区|日韩一区二区三区电影|中文字幕少妇人妻精品|免费在线观看黄片大全|一本一本久久久精品综合不卡|粗暴video蹂躏hd

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.