Patent ID: 8378242

Claim:
A circuit breaker comprising: a main body; a fixed contact fixed to the main body; a movable contact contactable with or separated from the fixed contact, the movable contact being movably installed at the main body; a main shaft connected to one side of the movable contact, the main shaft being rotatably installed on the main body; a trip mechanism coupled to another side of the main shaft and configured to rotate the main shaft; and a rebound preventer having one end rotatably installed on the main body and provided with a stopping unit formed at another end thereof and engaged with the main shaft, wherein the stopping unit is provided with a stopping groove including first and second contact surfaces facing each other, wherein the first contact surface comes in contact with a part of the main shaft when separating the movable contact so as to rotate the rebound preventer in a direction opposite to the main shaft being rotated, wherein the second contact surface restricts a reverse rotation of the main shaft when the second contact comes in contact with the part of the main shaft in a state where the rebound preventer has been rotated over a prescribed range.