... isolator, low-voltage isolator, low-voltage air switch and low-voltage knife switch, series F switch controls the process of making and breaking ... 40oC)Height above Sea Level (h≤3000m)t=+25, relative air humidity ≤ 90%Situation of no sharp pounding, no explosion risk ... , no inductive dust, no air destroying insulators or corroding metal and so on.Structure According ...