Electric anti-theft device, especially for a motor vehicle

The anti-theft device according to the invention comprises means (82) for inhibiting the power supply to the vehicle's ignition circuit which prevents the vehicle engine from starting as long as the motor (34) driving a locking member of the anti-theft device has not reached the unlocked position (92), the logic functions for controlling the locking and unlocking of the anti-theft device being implemented by hardwired logic and protected by connection of the terminals (A1, A2) supplying power to the electric motor (34) of the motorized anti-theft device to the polarities (+BAT, -BAT) of the vehicle battery.