Patent ID: 8823472
Filing Date: 2014-09-02
Classification: H01H,H03K

Abstract:
1. An electromagnetic contactor, comprising: a contact device having a pair of fixed contacts spaced at a predetermined interval with L-shaped portions extending at a predetermined length in a mutually facing direction and contact portions, and a movable contact having two ends disposed to be capable of contacting to and separating from the contact portions; an electromagnet unit including a magnetic yoke, an exciting coil disposed in the magnetic yoke, a movable plunger having a main portion disposed inside the exiting coil and a peripheral flange portion protruding outwardly from one end portion of the main portion above the exiting coil, a return spring disposed under the main portion to urge the movable plunger upwardly, and a ring-form permanent magnet disposed on the magnetic yoke and having a through hole to enclose the peripheral flange portion therein, the peripheral flange portion having a predetermined thickness in a movable direction of the movable plunger thinner than that of the ring-form permanent magnet to move in the through hole of the ring-form permanent magnet in the movable direction of the movable plunger; a connecting shaft connecting the movable contact of the contact device and the movable plunger; and a contact spring disposed on one end portion of the connecting shaft above the movable contact between the pair of fixed contacts to urge the movable contact downwardly, wherein the ring-form permanent magnet is magnetized in the movable direction of the movable plunger to assist movement of the movable plunger.