Self-blast circuit breaker with pressure relief valve and filling valve

摘要

The circuit breaker has a first assembly with a fixed contact having a fixed contact and an arc contact. A second assembly has a principle contact and moving arc contact with a breathing tube. The compression chamber (42) has a movable piston (60) opposed in motion to a valve (40) by the admission of gas from the compression chamber. A second valve (62) closes the entrance during the circuit breaking phase when the compression chamber pressure exceeds a predetermined level during the valve closed state.