Patent ID: 7227279

Claim:
A phase deficiency display device for a thermal magnetic type molded case circuit breaker provided with a bimetal member, which is bendable when heat is applied thereto, and a shifter coupled to an upper end of the bimetal member and horizontally movable in correspondence to a bending degree of the bimetal member when over-current is applied thereto, the display device comprising: a power source for supplying electric power; a display connected to the power source for displaying a phase deficiency; a stationary contactor electrically connected to the power source and having a stationary contact; a movable contactor electrically connected to the display and having a movable contact, the movable contactor being vertically movable and forming a circuit together with the power source and the display for displaying a phase deficiency condition when the movable contact contacts the stationary contact; an interlock lever rotatable in accordance with a horizontal movement of the shifter; a connection bar connected to the shifter and to the interlock lever for transferring a horizontal moving force of the shifter to the interlock lever; and a latch lever installed adjacent to and in mechanical communication with the interlock lever for restricting movement of the movable contactor when normal current is applied and to release the movement restriction of the movable contactor when the phase deficiency occurs.