GBL-21 Series 380V power distribution box for a capacity of 0.52 ~ 75kw electric motor control devices and lighting purposes. On the other line with the load of the power distribution box where the performance can also be used.
1, altitude not exceeding 2,000 m;
2, temperature: ambient air temperature is not higher than +40 ℃, in 24-hour period the average temperature is not higher than +35 ℃, ambient air is not less than -10 ℃.
3, the air must not have excessive dust, acid, salt, corrosive and explosive gas line. Relative humidity at the highest temperature is +40 ℃ not more than 50% at the low temperature, allows a higher relative humidity, such as +20 ℃ below 90%, taking into account the changes in f due to temperature may occasionally produce a general coagulation exposed.