| 摘要 |
PROBLEM TO BE SOLVED: To reduce the opening operation time of a moving contact in an overcurrent trip device of a circuit breaker for driving and opening the moving contact by an electromagnet before the tripping operation of a switching mechanism when a large current is being carried. SOLUTION: A pushing rod 27 linearly movably penetrating through a moving contact holder 6 for holding a moving contact 4 and abutting on the moving contact 4 is formed, and an electromagnet 18 of an overcurrent trip device 12 is arranged above the pushing rod 27 so as to linearly attract its movable iron core 21 in the moving direction of the pushing rod 27. The movable iron core 21 is attracted when a large current such as a short-circuit current flows through a current-carrying path, so that, the movable iron core 21 pushes and rapidly opens the moving contact 4 through the pushing rod 21.
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