Patent ID: 8097824
Filing Date: 2012-01-17
Classification: H01H

Abstract:
1. An arc extinguishing device of a circuit breaker for a manual motor starter including a detector detecting a fault current, an open/close mechanism operating in response to a detection signal of the detector, power source side and motor side stationary contact bars having stationary contacts, and movable contact bars having movable contacts each discrete from the stationary contacts by operation of the open/close mechanism, the device comprising: an arc chamber including a plurality of magnetic plates and a side wall packaging the plurality of magnetic plates for inducing and extinguishing an arc generated when the stationary contacts and the movable contacts are separated; a lower plate made of conductive material for supporting a lower end of the side wall; a first insulation member coupled to a distal end of the power source side stationary contact bar for interrupting the arc generated between the distal end of the power source side stationary contact bars and a distal end of the lower plate; a second insulation member coupled to a distal end of the motor side stationary contact bar for interrupting the arc generated between the distal end of the motor side stationary contact bar and the distal end of the lower plate, wherein the second insulation member is insertedly coupled to allow the distal end of the motor side stationary contact bar to be blocked, the second insulation member includes a ‘