Abstract: A protected reversing contactor is disclosed comprising two electromagnets intended to be alternately energized and whose armatures actuate two sets of respective phase switches and two acknowledgement switches mounted respectively in series in the supply circuit of the two coils of the two electromagnets. These two acknowledgement switches are actuated by a transmission system comprising two coaxial rotary shafts disposed end to end and each having an arm adapted to be driven in rotation, in one direction, by one of the electromagnets and a finger cooperating with the acknowledgement switch of the other electromagnet.

Abstract: A locking mechanism for a limiting contact maker is divulged comprising two levers which act respectively on two pusher blocks actuating the switches of a change-over contact maker. Each of these levers, articulated about a fixed shaft, comprises a roller applied to the profile of a rotary cam by a spring. This cam may pass from a locked automatic operational position in which it allows the switches to close by maintaining the levers away from the pusher blocks, to a tripped position in which the lever acts on the pusher blocks for holding the switches in the open position.