| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC breaker comprising an arc-extinguishing device in which a grid, contact part, magnetic material, etc. can be easily fitted so as to have preferable positional relationship and which performs excellent arc-extinguishing act.SOLUTION: A holding member 26 for holding permanent magnets 25, 25 includes a contact holding part 28 into which a fixed contact part 17 of a first fixture metal fitting 6 is to be inserted to enable integration. Arc-extinguishing plates 23, 23 include notches 27, 27 into which magnet holding parts 29, 29 of the holding member 26 are to be fitted to enable integration. Making the magnet holding parts 29, 29 hold the permanent magnets 25, 25 and the contact holding part 28 hold the fixed contact part 17, respectively and engaging the arc-extinguishing plates 23, 23 to which grids 24, 24... are fitted with the holding member 26 to integrate the plates and the holding member 26 establish positioning among the arc-extinguishing plates 23, 23, the grids 24, 24.., the permanent magnets 25, 25, an arc travel part 18, and a first fixed contact 5.SELECTED DRAWING: Figure 3 |
