A motor control center, MCC, unit selectively supplying power required for a motor or controlling rotation of the motor by changing a power supply direction, the MCC unit comprising: a drawer having a space for accommodating a circuit breaker; a hinge bracket installed on one of a left or right side of the drawer; a base connected to the hinge bracket by a hinge shaft; a display mechanism installation plate fastened to the base by a fastening member; a front door installed to rotate centered on the opposite side of the hinge bracket, wherein an opening is provided in a position of the front door corresponding to the display mechanism installation plate; the MCC unit characterized by: a door locker rotatably disposed in the front door; and a locking body fastened to the door locker and configured to be locked to the hinge bracket or unlocked therefrom; wherein the door locker comprises: a head portion spaced apart from the locking body, and a neck portion positioned between the head portion and the locking body and having a size smaller than that of the head portion; wherein the locking body is fastened to the neck portion; wherein the hinge bracket has a neck portion through hole through which the locking body is configured to pass and in which the neck portion is configured to be positioned in a penetrating manner; and wherein the locking body has a size smaller than that of the neck portion through hole, and is configured to, after the locking body passes through the neck portion through hole, rotate to be locked in the vicinity of the neck portion through hole in a forward direction. a drawer having a space for accommodating a circuit breaker; a hinge bracket installed on one of a left or right side of the drawer; a base connected to the hinge bracket by a hinge shaft; a display mechanism installation plate fastened to the base by a fastening member; a front door installed to rotate centered on the opposite side of the hinge bracket, wherein an opening is provided in a position of the front door corresponding to the display mechanism installation plate; the MCC unit characterized by: a door locker rotatably disposed in the front door; and a locking body fastened to the door locker and configured to be locked to the hinge bracket or unlocked therefrom; wherein the door locker comprises: a head portion spaced apart from the locking body, and a neck portion positioned between the head portion and the locking body and having a size smaller than that of the head portion; wherein the locking body is fastened to the neck portion; wherein the hinge bracket has a neck portion through hole through which the locking body is configured to pass and in which the neck portion is configured to be positioned in a penetrating manner; and wherein the locking body has a size smaller than that of the neck portion through hole, and is configured to, after the locking body passes through the neck portion through hole, rotate to be locked in the vicinity of the neck portion through hole in a forward direction. a door locker rotatably disposed in the front door; and a locking body fastened to the door locker and configured to be locked to the hinge bracket or unlocked therefrom; wherein the door locker comprises: a head portion spaced apart from the locking body, and a neck portion positioned between the head portion and the locking body and having a size smaller than that of the head portion; wherein the locking body is fastened to the neck portion; wherein the hinge bracket has a neck portion through hole through which the locking body is configured to pass and in which the neck portion is configured to be positioned in a penetrating manner; and wherein the locking body has a size smaller than that of the neck portion through hole, and is configured to, after the locking body passes through the neck portion through hole, rotate to be locked in the vicinity of the neck portion through hole in a forward direction. a head portion spaced apart from the locking body, and a neck portion positioned between the head portion and the locking body and having a size smaller than that of the head portion; wherein the locking body is fastened to the neck portion; wherein the hinge bracket has a neck portion through hole through which the locking body is configured to pass and in which the neck portion is configured to be positioned in a penetrating manner; and wherein the locking body has a size smaller than that of the neck portion through hole, and is configured to, after the locking body passes through the neck portion through hole, rotate to be locked in the vicinity of the neck portion through hole in a forward direction.