| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an electromagnetic tripping device for circuit breaker that can prevent a movable electromagnetic piece from rattling in an axial direction.SOLUTION: At a pivotal attachment part between a fixed electromagnetic piece 11 and a movable electromagnetic piece 12, an inner surface of a left arm part 18 is made to abut on an outer surface of a left-side arm part 11c and an outer surface of a right arm part 19 is made to abut on a right-side arm part 11c, respectively; and a coil spring 13 is accommodated between the left-side arm part 11c and right arm part 19 while shrunk in a right-left direction. Then the coil spring 13 can press the left-side arm part 11c and right arm part 19 positioned inside to outer side respectively, namely, to the sides of the left arm part 18 and right-side arm part 11c. Therefore, although a current which is large enough to make the movable electromagnetic piece 12 rotate does not flow, the movable electromagnetic piece 12 is prevented from rattling in an axial direction, and a chattering sound and a beat sound generated when the movable electromagnetic piece 12 rotates can be suppressed.</p> |
