The invention discloses a three-phase AC (
Alternating Current) high-
voltage vacuum
contactor with a long service life, which can achieve 24kV
voltage class and meet the requirements on one million-time mechanical life of a
contactor. The three-phase AC high-
voltage vacuum
contactor with the long service life comprises a
vacuum arc extinguish chamber arranged in an up-and-down structure, a soft connector, an insulating pull rod and a
brake separating spring. A casing of the
vacuum arc extinguish chamber is an integrated cylinder, the inner periphery of a shielding cylinder is provided with a convex ring of which the inner
diameter is matched with the external
diameter of the shielding cylinder, and the outer periphery of the shielding cylinder is connected with the inner periphery of the convex ring in a
hermetic seal way; the
radius of a
wave trough of a corrugated tube is identical to that of a
wave crest of the corrugated tube; the soft connector is formed by overlapping, tightly pressing and flattening a plurality of
copper foil tapes with identical width and length; the insulating pull rod comprises a
mandril of which the two ends are respectively provided with a
blind hole, a connecting piece embedded in the blind holes of the
mandril and an insulating sleeve sleeved outside the
mandril in an attaching way, and the middle part of the outside surface of the insulating sleeve is provided with a plurality of
layers of skirt rims at equal intervals; and a spring seat and a spring support seat of the
brake separating spring are respectively and detachably installed on an armature and a substrate.