Patent ID: 8324994

Claim:
A reversible electromagnetic contactor comprising: a pair of electromagnetic contactors disposed adjacent to each other; and a reversible unit mounted over the electromagnetic contactors; wherein the pair of electromagnetic contactors includes a movable contact support accommodated inside a body casing, and an operation display piece fixed to the movable contact support and protruding toward a display window provided in a unit mounting portion of the body casing; the reversible unit enters a pair of connection pieces not held in the initial position to an inside of display window to respectively connect to the operation display pieces; and at least one of the electromagnetic contactors and the connection pieces includes an erroneous mounting prevention unit to permit an entry of the connection piece when the connection piece attempts to enter a normal position inside the display window connectable to the operation display piece, and to prevent the entry of the connection piece when the connection piece attempts to enter a position inside the display window deviated from the normal position.