Patent ID: 8089016
Filing Date: 2012-01-03
Classification: H01H

Abstract:
1. A circuit breaker, comprising: a moving and a fixed contact with contact pieces which face one another for opening and closing; a switching shaft including a slot-shaped recess formed on the switching shaft; and a contact lever, the contact lever being rotatably mounted on or in the switching shaft and extending perpendicular to a longitudinal axis of the switching shaft, a free end of the contact lever extending from the switching shaft, carrying the contact piece of the moving contact on one side of an external contour of the contact lever, and including a first depression on an opposite side of the external contour for engaging a bolt which extends along the switching shaft, the contact lever being subjected to a torsional moment in a closing direction by way of the bolt in each case and including a second depression on a same side of the external contour towards the free end at a distance from the first depression, the contact lever, which rotates in an opening direction in an event of a trip, moving the bolt towards the side wall of the recess of the switching shaft which lies in the direction of movement, which, after coming into contact therewith as the contact lever continues to rotate, pushes the bolt out of the first depression into the second depression, the depth of which is such that after latching into the second depression, the bolt lies on the bottom of the recess, which rises radially in a closing direction in such a way that a counter force must be overcome in order to rotate the contact lever in the closing direction.