an electromagnetic actuator having a body and an electric motor driving at least one motion transmission element connected to the body via a brake device , a magnetic torque limiter , and a unidirectional transmission member , the brake device including an electrical activator member so that when the activator member is powered , the unidirectional transmission member is released relative to the body . when the activator member is not powered , the unidirectional transmission member is secured to the body and opposes pivoting of the transmission element in one direction of rotation up to a maximum transmissible torque defined by the magnetic torque limiter .