Electrical circuit for harmonic attenuation, equipment and facility including such a circuit

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