... high voltage outdoor circuit breakerZW7-40.5 series high voltage out door circuit breaker can be used for 50HZ 40. ... . They are mainly used in controlling and protection of out doorpower transmission and transformation system of 35kv, also in ... tightness and high temperature endurance, non-combustionand non-exploration, easy mounting, anti-aging and long service life.Ambient condition1. Altitude: ...