| 摘要 |
PROBLEM TO BE SOLVED: To prevent mistrip caused by its own closing operation with toggle mechanism in a circuit breaker. SOLUTION: A yoke 30 of a trip device 9 is installed as a supporting base instead of installing a trip lever 23 on a fixed frame of a mechanical part 8. With this modification, the mechanical 8 and the trip device 9 are held in a common case 10. Therefore, transmission of impact force due to closing operation between contacts 1 and 2 with the toggle mechanism to the trip lever 23 can be remarkably reduced, though not perfectly eliminated, to prevent mistrip because of transmission through the case 10 in comparison with support of the trip lever 23 by the fixed frame 13.
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