| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit breaker for wiring which protects an intermediate case located near a fixed contact from an arc gas thereby preventing the insulation deterioration without increasing the number of components.SOLUTION: A circuit breaker for wiring includes: an intermediate case 1 to which an opening/closing mechanism part and a fixed contact 9 are attached and fixed; and left and right cases 2 covering the intermediate case 1. An intermediate case protective member 14, protecting the intermediate case from an arc gas, is provided in a space between the fixed contact 9 and the intermediate case 1 located near the fixed contact 9 so as to be separated from the intermediate case 1. This structure increases a creepage distance and a space distance between the fixed contact 9 and the intermediate case 1 located near the fixed contact 9 and thus prevents the insulation deterioration due to the arc gas traveling from a space enclosed by insulators in a direction of an exhaust hole. |
