Patent ID: 7733199
Filing Date: 2010-06-08
Classification: H01H

Abstract:
1. An electrical circuit breaker having a protective function in case of a fault, the circuit breaker comprising: a switch mechanism moveable between an ON position and an OFF position; an electromagnetic tripping unit configured to act mechanically on the switch mechanism in response to a switch-OFF command, the tripping unit including: a mechanical operative connection disposed between the drive shaft and the tripping unit, the mechanical operative connection configured to reset the tripping unit when the drive shaft is moved out of the OFF position in a direction opposite from a rotational movement for switching on, wherein the mechanical operative connection includes a double-arm lever having a first arm acted upon by at least one catch device on the drive shaft and having a second arm configured to bring about the resetting movement of the tripping unit, and the mechanical operative connection is configured so that a rotation of the drive shaft is converted into a counter-rotation of the double-arm lever and the rotation of the double-arm lever becomes a linear movement of the solenoid armature, and wherein the second arm includes a prong and in the solenoid armature includes a groove configured to engage with the prong.