| abstract |
(57) [Abstract] [Purpose] To simplify the structure around an arc extinguishing chamber in a circuit breaker equipped with a deionized arc extinguishing device. An insulator 14 that straddles the grid 2 and the magnetically driven iron core 13 is integrally formed by molding resin, and the grid 2 is inserted into a groove formed in a sidewall 14a of the insulator 14 and the sidewall 14a is formed. The insulator 14 is fitted onto the leg portion of the magnetically driven iron core 13 through the concave portion formed in. Thereby, the support plate of the grid 2 and the insulating member of the magnetically driven iron core 13 are integrated with the insulator 14, and the structure is simplified. |