Device for deploying and retracting appendages of space systems comprising at least one support (2) carrying an appendage (1) to be deployed, which is mobile about a rotation spindle (4), and an actuator furnished with a collar (10) driving the said support in rotation by way of a coupling means (9) characterized in that the said coupling means is able in one direction of rotation to cooperate with at least one support (2.1, 2.2, 2.3) so as to drive the said support in rotation and to not cooperate with the said supports in the opposite direction of rotation.