| 摘要 |
The present invention relates to a puffer-type circuit-breaker including two arcing contacts that cooperate with each other, at least one of which is part of a moving contact assembly constituted by a first tube and a second tube that is coaxial with the first tube so as to define a blast chamber on one side of a first annular wall interconnecting the first tube and the second tube, and a compression chamber on the other side of said annular wall, which compression chamber is closed by a semi-moving piston. A first mechanical mechanism is provided for holding the piston stationary during a first portion of the displacement of the moving contact assembly from the closed position to the open position, a second mechanical mechanism provided for axially displacing the piston with the moving contact assembly during a second portion of the same displacement of the moving contact assembly, and a pneumatic device is provided for co-operating with the first mechanical mechanism in holding the piston stationary during the first portion of displacement.
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