Patent ID: 7541899

Claim:
A multi-pole circuit breaker, comprising: a plurality of single pole breaking units having a pair of fixed contactors, a movable contactor selectively contacting the pair of fixed contactors, and shafts to rotatably support the movable contactor; a switching mechanism disposed on one of the plurality of single pole breaking units in order to selectively cut off a circuit; a pair of driving shafts connected to each shaft in order to simultaneously transmit a rotation force generated by the switching mechanism to the shaft of each single pole breaking unit; and a driving shaft deformation prevention unit disposed between two adjacent single pole breaking units, and the driving shaft deformation prevention unit is spaced relatively far from the switching mechanism wherein the driving shaft deformation prevention unit comprises a pair of supporting blocks provided to face each other and configured to receive the driving shafts, and each of the supporting blocks is provided with a plurality of holding grooves each having a generally planar inclined surface portion that corrects deformation of the driving shafts.