Abstract: A load selector has an insulating cylinder, provided with fixed selector tacts inverting contacts and common point rings, in the interior of which is displaced a drive crankshaft on which are supported commutator modules. The drive crankshaft includes a male coupling element, a female coupling element associated with an upper crank, an off-center tube and a lower crank. A rolling mechanism serves as a lower bearing, and a rolling mechanism serves as the upper bearing. A drain tube is coupled to a central siphon tube which leads to an outlet formed in the lower crank.

Abstract: Each swiveling yoke (3) of a movable element 1 includes a stem 16 concent with a shaft 6 around which moves the swiveling yoke 3 and connecting the two arms 17 between which a roller 4 is free to rotate about a shaft 11; the outer surface of the stem 16 acts as a friction surface for a friction piece 18 comprising an elastic blade 19, a bead 20 made of a good electrically conducting material and a cable 27 connected by a cable terminal 26. The elastic blade 19 rests on two cross-pins 22 and 24 inserted into insulating plates 23.

Abstract: Electrical contact apparatus comprises a center holder supporting a principal roller actuated by a telescopic movement and two oscillating auxiliary holders each equipped with an auxiliary roller.