a casing;

first and second fixed contacts;

first and second moving contacts supported in the casing, independently moving between respective first and the second ON positions, respectively making contact with the first fixed contact and second fixed contact, and an OFF position with no contact between either of the first and second moving contacts and either of the first and second fixed contacts;

an operating member supported for movement in opposite directions relative to the casing, between a first position moving the first moving contact into the first ON position, a second position moving the first and second moving contacts into the OFF position, and a third position moving the second moving contact into the second ON position; and

a locking member, associated with the operating member, automatically locking the operating member in each of the first, second, and third positions, the locking member being releasable to unlock the operating member upon manual movement of the locking member in a direction different from directions of movement of the operating member between the first, second, and third positions.