To precisely position-regulate an operation handle in a prescribed position without requiring much labor for assembling by bringing the extended part of the elastic handle into contact with the contact part of an equipment body by a means for regulating the operation handle to a middle position.

When an operation handle 6 is operated on the other side in the opened state of a movable contact 5 and a fixed contact 3, the energizing force of an energizing spring 8 is reversely operated to bring the contact 5 into contact with the contact 3. When an overcurrent is carried, a movable piece 10 is displaced, interlocking with the bimetal 11 of an abnormal current detecting means 40, and the locking part 7e of a trip link 7 is released and rotated counterclockwise. Thus, a movable contact body 4 is also rotated counterclockwise by the spring 8, and the contact 5 is forcedly opened from the contact 3. At this time, the contact part 1j of a case 11 touches the elastic extended part 6b of the handle 6, and the pressed part 7f of the link touches its pressing part 6d, whereby the handle 6 is position-regulated substantially in the middle state between connection and opening of contacts.