| 摘要 |
PROBLEM TO BE SOLVED: To stabilize trip operation characteristics by simplifying the shape of a crossbar so as to improve its moldability, and by preventing unwanted sliding friction exerted between a pawl and a latch receiver in adjusting tripping current by axially moving the crossbar. SOLUTION: A trip crossbar 13 of a circuit breaker is provided between the operation end of a time limit tripping device and a latch receiver 12 connected to a latch 11 of a switch mechanism, and releases the latch 11 in response to the operation of an overcurrent tripping device. The trip crossbar 13 is composed of an insulating crossbar 15 and a pawl 21. The insulating crossbar 15 is journalled to a case 1 across poles, and on its shaft, an operation piece 16 opposite to an operation end of the overcurrent tripping device is formed. The pawl 21 latches and releases the latch receiver 12, according to rotational movement of the crossbar 15. The pawl 21 is rotatably supported separately from and parallel to the crossbar 15. An arm 21b projecting from the pawl 21 is abutted against the operation piece 16 of the crossbar 15 so that they are connected together.
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