Abstract: The invention relates to disconnection device designed to separate a first portion (11.1) of an electrical circuit (11) electrically from a second portion (11.2) of said circuit, the disconnection device comprising: at least one pair of contacts (16), one of which contacts (16.2) is a moving contact, the pair of contacts having an open state and a closed state; and a flexible conductor (21) fixed at one end to the moving contact (16.2) and serving to be fixed at the other end to one of the portions (11.1) of the electrical circuit. The conductor comprises a flexible tube (21) that is electrically conductive, at least at its surface, and that has bending stiffness that is low enough to enable it to bend without kinking, and torsion stiffness that is high enough to enable it to take up a shape and a position that are substantially reproducible at least in the closed state. Application in particular to gas-insulated high-voltage electricity substations.