| 摘要 |
A circuit breaker of the invention is formed of a container and a switch mechanism unit accommodated in the container. The switch mechanism unit is formed of a handle lever having a rotating shaft, a handle and lever arms; a movable contact having a movable contact point at one end with the other end rotatably joined with the lever arms; and a latch disposed to cross the rotating shaft and having a rotating shaft and an engaging arm protruding from the rotating shaft. A switch spring is disposed between the latch and the movable contact. The handle lever and the rotating shaft of the latch engage semi-circular bearing notches of a case and a cover of the container so that the switch mechanism unit is rotationally supported and held in the container.
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