| 摘要 |
The present invention relates to a circuit-breaker including, inside a casing filled with a dielectric gas, a first arcing contact connected to a first terminal, and a second arcing contact having the same longitudinal axis as the first contact. The second arcing contact is connected to a second terminal, is mounted to move axially in a fixed cylinder, and co-operates with a moving piston to form a compression chamber. The circuit-breaker further includes a mechanism for driving the piston in a direction that is opposite to the direction in which the second contact is displaced. The driving mechanism acts during a first portion of the displacement of the moving contact from the closed position to the open position the circuit-breaker also includes a mechanism for constraining the piston to move with the moving contact during a second portion of the same displacement of the moving contact.
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