ELECTRICAL harmonic attenuator, equipment and installation comprising such a circuit.

The invention relates to an electric circuit (110) for a device (102), particularly a railway equipment, powered by an alternating electric current, said core, said electric circuit (110) comprising at least component (114, 116) supplied with said and generating fundamental current in said electrical circuit (110) at least one unwanted alternating current, said harmonic, said circuit being characterized in that it further comprises a module (120) mitigation comprising: - at least one inductive means (122) coupled electrically with said electrical circuit (110), so that for each of said fundamental and harmonic currents, a current proportional to the same frequency is induced in said inductive means (122), and - at least one means (124) filter connected in series to said inductive means (122) for filtering the fundamental current induced in said inductive means (122) and passing the harmonic current induced. It also relates to a device (102) comprising such a circuit (110) and an installation (100) comprising such a device (102) and / or such a circuit (110).