Patent ID: 8772665

Claim:
A circuit breaker comprising: a plurality of grids laminated in a longitudinal direction, each of the plurality of grids comprising protruding portions extending from opposing sides of a front edge of the corresponding grid, the protruding portions defining a space therebetween; a fixing portion positioned along a back edge of each of the plurality of grids and configured to support each of the plurality of grids; a pair of first insulating plates fixedly connected to the opposing sides of each of the plurality of grids; a pair of second insulating plates, each of the pair of second insulating plates comprising a coupling portion coupled to a corresponding first insulating plate and an inclined portion that extends toward the plurality of grids into the space defined by the protruding portions such that an interval between the inclined portions is smaller than an interval between the coupling portions; a stator located below the plurality of grids, the stator comprising an arc runner and a stationary contact disposed on an upper side of the arc runner; and a mover configured to move toward and away from the stator and to contact and separate from the stationary contact in response to the movement, wherein the stationary contact and the mover are configured to generate an arc therebetween during a breaking process in which the mover separates from the stationary contact, wherein the stator is configured to induce the generated arc from the stationary contact to the arc runner, and wherein the interval between the inclined portions is substantially constant and smaller than a width of the arc runner passing edges of the pair of second insulating plates that define the interval between the inclined portions such that the generated arc induced onto the arc runner contacts at least one of the pair of second insulating plates.