久久亚洲精品AB无码播放,国产AV精国产传媒,久久人妻少妇嫩草AV蜜桃 ,久久99热狠狠色精品一区

Working condition of DC circuit breaker
1, the installation site altitude is not more than 2000m;
2, the ambient air temperature is not higher than +40 is not lower than -5, and the average value of 24 hours is not more than +35 (except for special order)
3, the installation location of the air relative humidity. The highest temperature of +40, no more than 50[%], at a lower temperature can be allowed to have a higher relative humidity, such as 2O 90[%]. Take special measures to be occasionally generated by dry temperature changes.
4, in the air in the air without an explosion hazard of the medium and the metal and the destruction of the insulation of the insulation of gas and electricity.
5, no rain and snow.
6, pollution level is 3.
7, installation category: the main circuit of the circuit breaker is installed in class III, the main circuit is not connected to the auxiliary circuit and control circuit installation category II