Patent ID: 8575502

Claim:
A circuit breaker comprising: a distributing board having a control circuit plug; a breaker main body having a control circuit connector, the control circuit plug being connected to or separated from the control circuit connector, and having terminals for receiving voltage and current; a cradle installed at the distributing board and having terminals connected to or separated from the terminals of the breaker main body; a movable carriage slidably installed at the cradle with the breaker main body being loaded; a transfer unit disposed between the movable carriage and the cradle and configured to convey the movable carriage; a first locking unit disposed between the control circuit plug and the control circuit connector and configured to selectively restrict the plug from being separated from the connector; an interlock unit coupled to the first locking unit to cooperatively move in a direction of the plug being inserted; and a second locking unit coupled to the interlock unit to selectively restrict the operation of the transfer unit in cooperation with the movement of the interlock unit.