Patent ID: 8168910

Claim:
An electrical contact for a medium-voltage vacuum circuit-breaker, extending along a longitudinal axis Y and including: a mechanical connection portion that extends along the longitudinal axis Y; a contact body that includes: a first hollow cylinder that includes spiral slots about its axis and opening at least onto its exterior, said first hollow cylinder being centered on the longitudinal axis Y and having one end fastened to the mechanical connection portion, the hollow of the first cylinder being empty of material, and the first cylinder constituting a first winding adapted to generate a magnetic field; a circular plate that has a diameter equal to the outside diameter of the first hollow cylinder, said plate being also centered on the longitudinal axis Y and fastened to the end of the first hollow cylinder opposite that fastened to the mechanical connection portion; and at least one stud that is distinct from the winding(s) and that is arranged, in the hollow of the first cylinder, as a spacer between the mechanical connection portion and the circular plate of the contact body in such a manner as to avoid the collapse thereof during a closing operation and in the closed position of the vacuum circuit-breaker, the studs having high electrical resistance such that when a given current flows in the contact, the amount of current that flows in the stud(s) is negligible relative to the current that flows in the winding(s), wherein the stud(s) is/are made from a metal tube filled with ceramic material(s).