| 摘要 |
An improved circuit breaker comprises means operating, when the contacts are welded closed and the cradle is released, to block the trip member or cradle against movement to a reset or relatched position and to maintain the operating handle in the closed position to thereby provide a true external indication of the closed condition of the contacts. The blocking means on the cradle strikes the contact arm in an opening direction when the cradle is released and the contacts are welded whereby if the weld is not firm the striking action will break the weld and open the contacts. |
