The subject-matter of the invention is an electrical device comprising: a casing comprising a cavity receiving an electrical component, and at least two conductors connected to the electrical component so as to supply it with electric energy, both conductors being superimposed with each other and extending in parallel, said device being characterised in that it comprises an electric insulating film folded on itself around a fold, and a first part of which located on a side of the fold comes against a surface of the first conductor so as to electrically insulate it, and a second part of which located on the other side of the fold is inserted between both conductors so as to electrically insulate them from each other.