| 摘要 |
In a circuit breaker which has an arc runner (2) fixed on a curved fixed conductor (1), an upright part (11b) is formed in extended part of the fixing part (2B) of the arc runner (2); and the upright part (11b) works to retain the arc to prevent from excessive outward running of arc, and further, when made of ferromagnetic plate, also works to shield undesirable effect by magnetic field of power source side current on arc commutation from intercontact-point path to arc-runner path.
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