| 摘要 |
A circuit breaker includes an insulating casing, a stationary main contact, a stationary arcing contact. A moving main contact and a moving arcing contact constituted by a tube define a blast cylinder co-operating with a first fixed piston. A second piston secured to a moving assembly includes the tube and slides in a second stationary cylinder. The volume between the two cylinders is put into communication with a volume adjacent to the casing or with a volume inside the tube via openings. An inertial ring selectively closes off the openings by moving between first and second extreme positions, the first position being one in which the openings are open and corresponding to a rest position for the moving assembly, and the second position being one in which the openings are closed.
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