Abstract: Device for supplying electric current to at least one series-excitation motor, characterized in that it includes a chopper comprising a midpoint (M) linked to the rotor of the motor and to which are connected at least one first controlled static switch which is additionally connected to a voltage source for applying a supply current in traction mode to the electric motor and at least one second controlled static switch, additionally linked to earth, for closing a circuit for linking with a load for the motor operating in generator mode during braking and reverse-biased diode-type changeover-switching means for respectively allowing the supply current of the motor delivered by the first controlled static switch to pass in a first direction while the latter is conducting, and for allowing the current delivered to the circuit for linking with the load by the motor operating in generator mode to pass in a second direction through the second controlled static switch when the latter is conducting.