| 摘要 |
A circuit breaker (100) for use between a load and a power source, comprising at least two movable contacts (212/222) for electrical connection to the load and power source respectively, a movable contact holder (220) holding the first contact (222), a first spring (224) biassing the contact holder (220) to move, and an actuator (210) arranged to move the second contact (212) into contact with the first contact (222). A locking frame (230) is arranged to lock the contact holder (220) and in turn the first contact (222) at a specific position into the path of movement of the second contact (212), against the action of the spring (224), for contact by the second contact (212). The locking frame (230) is supported for pivotal movement between a first position locking the contact holder (220) in said specific position and a second position releasing the contact holder (220) from said specific position. A second spring (238) biasses the locking frame (230) towards the second position. A solenoid (240) is operable to hold the locking frame (230) in the first position against the action of the second spring (238). An electronic control circuit (300) is adapted to detect the occurrence of a circuit fault and in response to disable the operation of the solenoid (240).
|
