| 摘要 |
PURPOSE:To prevent burning of a stabilizer due to fusion of thermo-element by arranging a plurality of heating bodies which allow thermoelements to operate and allowing the heating body or the vicinity part of the heating body to be disconnected by discharge. CONSTITUTION:In normal state, the auxiliary discharge generated between a main electrode 3a and an auxiliary electrode 10 allows a bimetal 6a to operate, and main discharge is generated between the main electrodes 3a and 3b. The contact between the movable contact 15 of the bimetal 6b and the fixed contact rod 14 is opened after translation to main discharge. If the movable conact 15' of the bimetal and the contact between the movable contact 15 and the fixed conact rod 14 is released, 6b and the fixed contact rod 14' are fused, the bimetal 16b operates, and a contact lead 21, fixed contact rod 14', filament 7, bimetal 6b, or filament fixing rod 22, or a conducting lead 5a is fused, then current stops, and burning of a stabilizer can be prevented. |
