Improved arc breaking medium voltage vacuum interrupter contact and associated vacuum interrupter

摘要

Electrical cut-off contact (3) with a radial magnetic field for a medium-voltage vacuum interrupter comprising a rod (5) and a contact body (7), coaxial with the rod, which comprises a disc (9) and a circular element ( 10), concentric with the disc and projecting from one face of the disc, the other face of the disc being integral with the rod. The contact body has a spiral configuration; the disc has slots in the thickness of the disc that extend from the periphery of the disc towards the center of the disc; the circular element has an external diameter smaller than the diameter of the disc. The disk and the circular element are made of a copper alloy with a refractory metal chosen from chromium, tungsten and molybdenum, the alloy of the circular element comprising a higher proportion by weight of the refractory metal than that of the disc alloy. Figure for abstract: figure 2