| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit breaker preventing itself from falling off due to shock of a movable contact point firmly fixed to a movable contactor in stopping the movable contactor at an open-pole terminal position. SOLUTION: At a tip-side lower part of a power source side contact arm 18a constituting a movable contactor, a concave-shaped notched part 18a1 is formed with its side parts opened. The notched part is provided with a firm-fix face 18a2 firmly fixing the movable contact point 18c, and a pair of movable-contact fixing walls 18a3 erected from edge parts at a tip side and a rear-end side of the firm-fix face for preventing the movable contact point from being separated from the firm-fix face. The movable contact point is inserted into the notched part from the opening at the side part to be firmly fixed to the firm-fix face, and at the same time, a pair of side faces 18c4 facing the tip side and the rear-end side of the movable contact point are locked by the pair of movable-contact fixing walls. Furthermore, a structure of a load-side contact arm constituting the movable contactor and the movable contact point firmly fixed to the same is of the same structure. COPYRIGHT: (C)2011,JPO&INPIT
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