| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit breaker in which an adjustment work can be made so as to bring a gap between an moving member and an operating plate close to an initial design value independently for each pole, without changing the lower limit value of the tripping current in the excess current tripping device, and in a state of installation in the circuit breaker, an adjustment more than necessary is prevented even if a large change is added accompanying the adjustment work. SOLUTION: In the multipole circuit breaker having the excess current tripping device 110 of complete electromagnet type which has an oil dash pot 110b as a time-delay tripping element, in order to adjust the size of a gap between a switching mechanism 102 to which the excess current tripping device 110 works for tripping, an adjusting means 110f which adjusts only the size of the gap between an operating plate 105 of the switching mechanism 102 and an operating piece 110e of a movable iron piece 110d is provided without changing the size of the gap between the movable iron piece 110d and the oil dash pot 110b. COPYRIGHT: (C)2010,JPO&INPIT |
