Trip device for circuit breaker

A trip device for a circuit breaker, the trip device comprising:

• a crossbar that performs a trigger function and that moves in a direction of movement of a rotating shaft of the crossbar;
• and
• a bimetal that curves upon occurrence of an abnormal current and presses and rotates the crossbar via a gap adjustment member,
• wherein the crossbar comprises:
• a pipe-like body portion;
• and
• a contact portion extending from the body portion;
• wherein the contact portion comprises:
• a cylindrical contact protrusion protruding in the direction of the tangent to a circular trajectory around the rotating shaft;
• and
• a crossbar contact surface formed at right angles to the length of the cylindrical contact protrusion at the end of the contact portion;
• wherein the gap adjustment member comprises:
• a coupling part that attaches to and detaches from the bimetal;
• and
• a gap adjustment part that is formed on an upper part of the coupling part, the gap adjustment part adjusting the gap between the bimetal and the crossbar;
• wherein the gap adjustment part comprises:
• a flat first side that is parallel to the crossbar contact surface;
• and
• a sloped second side that is formed on a back of the flat first side, the sloped second side being inclined in a horizontal direction to the crossbar contact surface;
• and
• wherein a rectangular shaped recess is formed on a bottom side of the coupling part to receive an end of the bimetal.