Winding for a contact of a medium-voltage vacuum circuit-breaker with improved arc extinction, and an associated circuit-breaker and vacuum circuit-breaker, such as an AC generator disconnector circuit-breaker

An electrical contact for a medium voltage vacuum circuit-breaker extending along an longitudinal axis Y and comprising:

• a mechanical connection portion that extends along the longitudinal axis Y;
• a contact body that includes:
• a first arc control structure based on a material of low electrical resistance and of a diameter typically greater than 90 mm, configured to generate a magnetic field in an electrical contact for a medium voltage vacuum circuit-breaker, the structure comprising a first hollow cylinder having a wall of a predetermined thickness and a predetermined circumference, the first hollow cylinder including helical slots arranged in parallel around a central axis of the first hollow cylinder and traversing the predetermined thickness of the wall of the first hollow cylinder, a length of each helical slot being equal to at least the predetermined circumference of the first hollow cylinder;
• and
• a circular plate that has a diameter equal to the outside diameter of the first hollow cylinder, said plate also being centered on the longitudinal axis Y and being fastened to the end of the first hollow cylinder that is opposite from the end fastened to the mechanical connection portion.