PURPOSE: To facilitate a discrimination of a terminal to which a power source side wiring is connected, in a molded-case circuit-breaker, which can be connected reversely.

CONSTITUTION: Each display lamp 11 is connected to an upper side terminal 2 and a lower side terminal 3 of a molded-case circuit-breaker 7, which can be connected reversely, and these display lamps 11 are arranged on the surface of the molded-case circuit-beaker 7 so as to be close to each terminal 2, 3. Since the display lamp 11 of the side, to which a power source wiring is connected, is always lit, a discrimination that which of the terminals 2, 3 is connected to the power source side is facilitated to eliminate a danger of the electric shock to be caused by touching the power source side terminal by mistake.