Patent ID: 7538644

Claim:
A multi-pole circuit breaker, which includes: a plurality of single pole breaking units having a pair of fixed contactors, a movable contactor rotatable to a contacted position to fixed contactors or a separated position from the fixed contactors, and shafts for rotatably supporting the movable contactor; a switching mechanism disposed on one of the plurality of single pole breaking units in order to provide a rotation force to the shafts; and a pair of driving shafts commonly connected to the shafts in order to simultaneously transmit a rotation force from the switching mechanism to the shafts of the plurality of single pole breaking units, comprising: a substrate disposed between the single pole breaking units that do not include the switching mechanism, spaced relatively far from the switching mechanism as compared to the other single pole breaking units among the plurality of single breaking units, and the adjacent single pole breaking unit; a link mechanism rotatably supported on the substrate, for providing a compensating rotation moment to the driving shafts so that a contact force between the contactors in the single pole breaking unit relatively far from the switching mechanism may not be smaller than a contact force between the contactors in the other single pole breaking units; and springs having one ends supported by the substrate and the other ends supported by the link mechanism, for providing an elastic force to the link mechanism for the provision of the compensating rotation moment.