auxiliary contact for Vacuum circuit breaker Applied in HV equipment,such as ... device for High-voltage circuit-breaker, high-voltage isolator, low-voltage isolator, low-voltage air switch and low-voltage ... 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. ...