A circuit breaker comprising: a fixed contactor connected to a circuit; a movable contactor movable to a closed state in which the movable contactor is in contact with the fixed contactor and a broken state in which the movable contactor is separated from the fixed contactor; an opening and closing mechanism configured to convert a rotational motion of a plurality of links and a rotational shaft to enable the movable contactor to be brought into contact with the fixed contactor or separated therefrom; an OFF shaft arranged to rotate to start a breaking operation of the circuit breaker; a trip latch assembly locked to or unlocked from a main link provided in the opening and closing mechanism, the trip latch assembly, when locked to the main link, being arranged to rotate to be unlocked from the main link when the OFF shaft is rotated, a rotational shaft arranged to penetrate the trip latch assembly so as to be a rotation axis of the trip latch assembly, and an OFF button configured to rotate the trip latch to unlock the trip latch from the main link when manually pressed, characterized in that the trip latch assembly has two trip latches arranged to be parallel in a length direction of the trip latch assembly and being coupled by a connection pin, wherein the OFF button includes a lever member integrally formed with the OFF button to rotate the trip latch, and wherein a surface of one of the two trip latches of the trip latch assembly includes a protrusion member having a predetermined length towards the lever member along an axial line direction of the rotational shaft, and wherein the protrusion member is arranged to be pressed by the lever member when the OFF button is pressed wherein the trip latch assembly is rotated and unlocked from the main link and the circuit breaker is changed into a broken state. a fixed contactor connected to a circuit; a movable contactor movable to a closed state in which the movable contactor is in contact with the fixed contactor and a broken state in which the movable contactor is separated from the fixed contactor; an opening and closing mechanism configured to convert a rotational motion of a plurality of links and a rotational shaft to enable the movable contactor to be brought into contact with the fixed contactor or separated therefrom; an OFF shaft arranged to rotate to start a breaking operation of the circuit breaker; a trip latch assembly locked to or unlocked from a main link provided in the opening and closing mechanism, the trip latch assembly, when locked to the main link, being arranged to rotate to be unlocked from the main link when the OFF shaft is rotated, a rotational shaft arranged to penetrate the trip latch assembly so as to be a rotation axis of the trip latch assembly, and an OFF button configured to rotate the trip latch to unlock the trip latch from the main link when manually pressed, characterized in that the trip latch assembly has two trip latches arranged to be parallel in a length direction of the trip latch assembly and being coupled by a connection pin, wherein the OFF button includes a lever member integrally formed with the OFF button to rotate the trip latch, and wherein a surface of one of the two trip latches of the trip latch assembly includes a protrusion member having a predetermined length towards the lever member along an axial line direction of the rotational shaft, and wherein the protrusion member is arranged to be pressed by the lever member when the OFF button is pressed wherein the trip latch assembly is rotated and unlocked from the main link and the circuit breaker is changed into a broken state.