The field of the invention is that of safe devices for operating the actuators of aircraft and more specifically the flight control actuators of a helicopter. The invention consists of a safe control device for commanding an actuator (15) movement comprising at least two independent calculation chains (120), (130), a circuit for mixing instructions (65) and a power stage (88), each calculation stage delivering a direction of movement instruction and a speed of movement instruction for the actuator, the instructions being transmitted to the circuit for mixing instructions (65) in order to generate a primary movement command for the actuator comprising modulated pulse trains, the power stage receiving the primary movement command and delivering a power movement command to the actuator (15). According to the invention, the circuit for mixing instructions (65) compares the direction of movement instructions and the speed of movement instructions in pairs in order to generate the primary movement command for the actuator.