Patent ID: 6980070
Filing Date: 2005-12-27
Classification: H01H,H02P

Abstract:
1. A drive unit for switching a circuit breaker on and off, comprising: a reversible d.c. motor; a switching device including two separately drivable and interlocked reversing switches, each of the reversing switches being assigned to a respective direction of rotation of the d.c. motor, contacts of the reversing switches performing a current reversal on windings of the d.c. motor as is necessary to reverse the direction of rotation of the d.c. motor; power contactors, contacts of the power contactors having a switching capacity for load switching, the reversing switches and the power contacts assigned to each direction of rotation being formed by a respective low-power relay, each low-power relay including at least two electrically isolated relay contacts connectable in parallel; and an equalizing capacitor connected in parallel to each of the relay contacts of each low-power relay.