Abstract: A set (40) of electrical switching contacts (1, 2) for a vacuum breaker (100) is proposed, comprising: a first contact (1), a second contact (2) movable along an axis of movement (A), each contact (1; 2) having the shape of a disc comprising a set of branches (5a, 5b, 5c; 6a, 6b, 6c) separated by a slot (7a, 7b, 7c; 8a, 8b, 8c) crossing the thickness of the disc, in which each branch (5a, 5b, 5c) of the first contact (1) and each branch (6a, 6b, 6c) of the second contact (2) comprises an inclined surface (9a, 9b, 9c; 10a, 10b, 10c), and in which the first contact (1) and the second contact (2) are angularly linked so that: the slots (7a, 7b, 7c) of the first contact (1) coincide with the slots (8a, 8b, 8c) of the second contact (2), and the inclined surface (9a, 9b, 9c) of one branch (5a, 5b, 5c) of the first contact (1) and the inclined surface (10a, 10b, 10c) of one branch (6a, 6b, 6c) of the second contact (2) are opposite to each other.

Abstract: A method for testing capacitive current switching of a circuit breaker, including: realizing a capacitive current switching by the circuit breaker, measuring voltage at the terminals of the circuit breaker after the capacitive current switching, calculating the gradient of the measured voltage, determining whether there is at least one point of gradient whose amplitude exhibits an absolute value greater than a first predetermined threshold, and when such a point is determined, identifying the instant of appearance of the determined point and of the amplitude of variation of the voltage at that instant, as voltage drop.

Abstract: An electrical breaking contact, in particular a radial-magnetic-field electrical breaking contact, is provided for a medium-voltage vacuum interrupter, the contact including: a rod extending along a longitudinal axis, said rod being configured to be passed through by an electrical current, a contact body extending transversely to the longitudinal axis and including a first fastening surface, the contact body and the rod being coaxial, wherein the rod includes: a second fastening surface securely fastened to the first fastening surface, an abutment surface radially exterior to the first fastening surface (4), the abutment surface being distant from the contact body along the longitudinal axis and turned toward the contact body.

Abstract: An electrical breaking contact, in particular a radial-magnetic-field electrical breaking contact, is provided for a medium-voltage vacuum interrupter, the contact including: a rod extending along a longitudinal axis, said rod being configured to be passed through by an electrical current, a contact body extending transversely to the longitudinal axis and including a first fastening surface, the contact body and the rod being coaxial, wherein the rod includes: a second fastening surface securely fastened to the first fastening surface, an abutment surface radially exterior to the first fastening surface (4), the abutment surface being distant from the contact body along the longitudinal axis and turned toward the contact body.

Abstract: Electrical switching contact with radial magnetic field for a medium-voltage vacuum interrupter including a rod and a contact body, coaxial to the rod, which includes a disc and a circular element concentric with the disc and arranged protruding on a face of the disc, the other face of the disc being secured to the rod. The contact body has a spiral configuration; the disc includes slits in the thickness of the disc which extends from the periphery of the disc towards the centre of the disc; the circular element has an outer diameter smaller than the diameter of the disc. The disc and the circular element are made of a copper alloy with a refractory metal chosen from among chromium, tungsten and molybdenum, the alloy of the circular element including a proportion by weight of the refractory metal greater than that of the alloy of the disc.

Abstract: A method for testing capacitive current switching of a circuit breaker, including: realizing a capacitive current switching by the circuit breaker, measuring voltage at the terminals of the circuit breaker after the capacitive current switching, calculating the gradient of the measured voltage, determining whether there is at least one point of gradient whose amplitude exhibits an absolute value greater than a first predetermined threshold, and when such a point is determined, identifying the instant of appearance of the determined point and of the amplitude of variation of the voltage at that instant, as voltage drop.