A multi-couplings plate for the simultaneous connection of several fluid and/or electrical couplings, the plate having a locking device in a connecting direction for connector elements supported by the plate to complementary connector elements supported by a second plate, the locking device comprising a frame fixed on the plate, locking members and a drive mechanism, the drive mechanism comprising: - a rotary element mounted rotating in the frame, between an uncoupled configuration and a coupled configuration of the plate, - a sliding element translatable relative to the frame along the connecting direction and which cooperates with the locking members, the locking members being movable relative to the sliding element between a first unlocked position where they free a passage for the second plate relative to the sliding element, and a second locked position where they are able to secure the sliding element and the second plate in the connecting direction, - one or more elements for converting the rotational movement of the rotary element into a translational movement of the sliding element, in the uncoupled configuration, the sliding element is in a forward position relative to the frame and the locking members are able to come into their first unlocked position, in the coupled configuration, the sliding element is in a withdrawn position relative to the frame and the locking members are able to come into their second locked position, characterized in that the locking device also comprises: - several ratchet notches (301-309; 311-318) secured to an element (18; 20) of the drive mechanism and juxtaposed in the movement direction relative to the frame of the element (18; 20) of the drive mechanism, the ratchet notches (301-309; 311-318) comprising a final notch (309; 318) and at least one intermediate notch (303-308; 312-317), and - a pawl movable in a housing of the frame and pushed back by a spring toward one of the ratchet notches (301-309; 311-318); and in that: - when the pawl cooperates with the intermediate notch (303-308; 312-317), the pawl limits the movement of the sliding element toward its forward position to a position midway between the forward position and the withdrawn position, and - in the coupled configuration, the pawl cooperates with the final notch (309; 318) and keeps the sliding element in the withdrawn position. - a rotary element mounted rotating in the frame, between an uncoupled configuration and a coupled configuration of the plate, - a sliding element translatable relative to the frame along the connecting direction and which cooperates with the locking members, the locking members being movable relative to the sliding element between a first unlocked position where they free a passage for the second plate relative to the sliding element, and a second locked position where they are able to secure the sliding element and the second plate in the connecting direction, - one or more elements for converting the rotational movement of the rotary element into a translational movement of the sliding element, - several ratchet notches (301-309; 311-318) secured to an element (18; 20) of the drive mechanism and juxtaposed in the movement direction relative to the frame of the element (18; 20) of the drive mechanism, the ratchet notches (301-309; 311-318) comprising a final notch (309; 318) and at least one intermediate notch (303-308; 312-317), and - a pawl movable in a housing of the frame and pushed back by a spring toward one of the ratchet notches (301-309; 311-318); and in that: - when the pawl cooperates with the intermediate notch (303-308; 312-317), the pawl limits the movement of the sliding element toward its forward position to a position midway between the forward position and the withdrawn position, and - in the coupled configuration, the pawl cooperates with the final notch (309; 318) and keeps the sliding element in the withdrawn position.