| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit breaker capable of interrupting the arc to be generated when a contact is turned off. SOLUTION: When turning on a switching means, a cross bar 23 pushes a movable contact 8 to a fixed contact 7 side so that a movable contact 9 and the fixed contact 7 contact with each other. An arm 30 fitted to the cross bar 23 freely to be turned pushes a projection 27c of a shielding member 27 so as to restrain the shielding member 27 in the condition that the shielding member 27 is moved to the restoring position while resisting the spring energizing force of a coil spring 28. On the other hand, when the pushing force of the cross bar 23 for pushing the movable contact 8 to the fixed contact 7 side is eliminated when turning off the switching means or at the time of tripping the switching means, the movable contact 9 and the fixed contract 7 are separated from each other. Since the force of the arm 30 for pushing the projection 27c of the shielding member 27 is eliminated, a shielding piece 27c of the shielding member 27 is made to enter between both the contacts 7, 9 by the spring restoring force of the coil spring 28.
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