Riversible electromagnetic contactor

摘要

An electromagnetic contactor (1a) is provided with an erroneous mounting prevention unit (8) which permits an entry of a connection piece when a connection piece (6f) of a reversible unit (6) attempts to enter a normal position (NP) inside a display window (3a) where the connection piece is connectable to an operation display piece (4a), and prevents the entry of the connection piece when the connection piece attempts to enter a position inside the display window (3a) deviated from the normal position (NP).