| 摘要 |
PROBLEM TO BE SOLVED: To provide a tripping device for a circuit breaker where only a branch circuit breaker is in an opening passage state and a primary circuit breaker maintains closing passage state when abnormal current occurs on the load side of the branch circuit breaker, in an electric circuit connecting the primary circuit breaker with the branch circuit breaker. SOLUTION: This tripping device is constituted to have a trip latch mechanism 15 for opening an opening/closing contact in lock releasing time, a fixing core 18, a movable core 19 that is attracted to the fixing core 18 and releases the locking of a latch mechanism 15 of a trip lever, an operation pin 22 for preventing movement of the movable core 19 on the way of the attraction of the movable core 19, an operating spring 23 energized during attraction of the movable core 19, and an inertia roller 21 that holds the operation pin 22 and is kicked when of the operation pin 23 is deenergized to displace to a position where the movement of the movable core 19 is not prevented.
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