| 摘要 |
PROBLEM TO BE SOLVED: To save a space for fitting part while eliminating a projection from the outline of a contact by cutting out a case peripheral wall so as to provide a case side lock part, and fitting a flexible lock part of an arc-extinguishing cover therein. SOLUTION: An arc-extinguishing cover side lock part 26 formed into a T-shape by cutting out a root thereof and formed with an inclined surface 32 at a tip thereof is projected downward from an arc-extinguishing cover 4. A peripheral surface 1A of an insulating case 1 is provided with a lock groove 29 to be engaged with the lock part 26 and cut out into a T-shape, and a lock part 27 for opening the lock groove 29 step by step is formed so as to form a lock mechanism 28 with the cover side lock part 26. In case of fitting the cover 4 to the case 1, the cover side lock part 26 rides over the peripheral wall 1A of the case 1, and thereafter it is fitted in the lock groove 29 for lock. In the case of unlocking, and operating bar 31 is inserted between the inclined surface 32 of the tip of the lock part 26 and the lock groove 29 from under thereof, and pushed to the case 1 side so as to bend the lock part 26 and easily unlock the lock mechanism 28.
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