| 摘要 |
The electric circuit-breaker includes an interrupting chamber with at least one moving contact inside the chamber, the moving contact being actuated by means of a spring-loaded mechanical control mechanism so as to open or close the circuit-breaker. The control mechanism includes at least one first spring exerting a force tending to move the moving contact to open the circuit-breaker, and a second spring exerting a force tending to move the moving contact to close the circuit-breaker while loading the first spring. An additional spring is provided for exerting an additional force that is added to the force exerted by the first spring at the beginning of circuit-breaker opening. The additional spring is mounted so that, before the end of circuit-breaker opening, the resultant of the force exerted by the additional spring for moving the moving contact is reversed so as to oppose the movement of the moving contact. The additional spring thus accumulates some of the kinetic energy from the moving contact at the end of opening.
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