| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a circuit breaker in which an electromagnetic repulsion force, generated by a current flowing in an arc contact between a stationary contact assembly and a movable contact assembly at a time of flowing an excess current, is reduced or diverted. Ž<P>SOLUTION: The circuit breaker includes a plurality of main contacts and arc contacts 220, 230 for shutting down a current flow when an excess current status takes place, and each of the arc contacts 220, 230 includes contacting surfaces 305, 310 which are displaced with an angle against a rotating point 215 of at least one contact, and displacements of the contacting surfaces 305, 310 are structured so that a repulsion force moment arm 315 from the rotating point 215 of at least one contact is made smallest. Moreover, the arc contacts 220, 230 are structured so that the arc current progresses for a longer distance. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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