草莓福利导航_中文字幕一区二区三区无码av_黄金网站9.1直接进入_在房间打扑克又疼又叫又开心_中文中字无码字幕在线观看_老熟妇在线视频播放_秋霞免费鲁丝片无码84_一本大道av伊人久久精品_高清欧美三级自拍_国语自产偷拍精品视频偷777

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.