An air circuit breaker comprises: a cam connected to a rotational shaft to be rotated; a driving lever connected to the cam to be rotated; a closing spring connected to the driving lever to be compressed by the rotation of the driving lever; and a plurality of links for transferring a tensile force generated when the closing spring is tensioned to a switching shaft connected to a movable contact,wherein at least one of the plurality of links has a structure that a plurality of members are coupled to one another, whereby operation reliability of the air circuit breaker can be enhanced and a lifetime thereof can be elongated by preventing abrasion or damage from being occurred on the links during the operation of the air circuit breaker.