HERMOMAGNETIC CIRCUIT BREAKER

摘要

PROBLEM TO BE SOLVED: To easily display the cause of a trip in the event of the trip of a thermomagnetic circuit breaker by providing a trip function and a display means, and making two trip bars independently movable so as to display the state. SOLUTION: When an instantaneous current is generated in a current path 14, an armature 80 accompanied by an armature bearing 81 is magnetically attracted by a magnet 82. The armature 80 rotates a first trip bar 42 clockwise around a trip bar bearing 47 in cooperation with the first terminal of the first trip bar 42. The first hook 49 of a first trip lever 44 is thus released from the first ratchet surface of the first trip bar 42. A second ratchet 29 is rotated counterclockwise around its bearing 30, whereby the finger 31 of the second ratchet 29 is separated from the support surface 32 of the first ratchet 27. When the ratchet lever surface 25 is separated from the ratchet surface 26, a movable contact arm 20 is opened to cut the line.