... equipment.. ... 3 good quality 4 best price F10 Auxiliary switch Being used as auxiliary device for High-voltage circuit-breaker ... , low-voltage isolator, low-voltage air switch and low-voltage knife switch, series F switch controls the process of making and breaking ... ≤ 90% Situation of no sharp pounding, no explosion risk, no inductive dust, no air destroying insulators or corroding metal and so ...