Disclosed is a
display device for a thermal magnetic type molded case
circuit breaker capable to display a phase deficiency occurred on a line to a user such that the user rapidly deals with the phase deficiency and prevents loss caused by over-heating generated due to the phase deficiency. The thermal magnetic type molded case
circuit breaker has a
bimetal, which is bendable when heat is applied thereto, and a shifter coupled to an upper end of the
bimetal and horizontally moved corresponding to a bending degree of the
bimetal when over-current is applied thereto. The
display device includes a power source for supplying
electric power, a display for displaying the phase deficiency of the thermal magnetic type molded case
circuit breaker by receiving power from the power source, a stationary
contactor electrically connected to the power source and having a stationary contact, and a movable
contactor electrically connected to the display and having a movable contact. The movable
contactor vertically moves and forms a circuit together with the power source section and the display for displaying the phase deficiency state when the movable contact contacts with the stationary contact. A
interlock lever rotates according to a horizontal movement of the shifter. A connection bar makes contact with both shifter and
interlock lever so as to transfer horizontal moving force of the shifter to the
interlock lever. A latch lever is installed adjacent to the interlock lever in order to
restrict a movement of the movable contactor when normal current is applied and to release a restriction of the movable contactor when the phase deficiency occurs.