electromagnetic contactor

Abstract

To provide an electromagnetic contactor in which contact reliability is improved by avoiding a conduction failure at opening / closing of a main circuit by restricting turning of a movable contactor, and a problem of degrading of insulation and arc-extinguishing performance between contact points of the movable contactor is solved.SOLUTION: When a movable contactor 13 moves upward and downward, a front side sliding section 45, a rear side sliding section 46, a left side sliding section 47, and a right side sliding section 48 of a sliding member 43 fixed to four sides (front, rear, left, and right) of a contact support 14 abut and slide on a front side rotation restricting section 53, a rear side rotation restricting section 54, a left side rotation restricting section 55, and a right side rotation restricting section 56 of a rotation restricting member 50, consequently the turning of the movable contactor 13 is restricted. Even when arrangement of arc-extinguishing permanent magnets 42a and 42b are changed by design change, eccentricity of a movable plunger 21 due to magnetic attraction is restricted by the rotation restricting sections arranged at front, rear, left, and right of the rotation restricting member, so that direct acting property of the movable plunger is improved.SELECTED DRAWING: Figure 5

Claims

1. A first and second fixed contactor having a first fixed contact and a second fixed contact, A movable contactor having first and second movable contacts at both ends in the longitudinal direction that can move toward and away from the first fixed contact and the second fixed contact, An electromagnet unit that drives a movable plunger connected to the movable contact via a movable contact support to drive the movable contact in a reciprocating direction to move toward and away from the first and second fixed contacts, A storage case for housing the first and second fixed contacts, the movable contact, and the electromagnet unit, It comprises at least one pair of arc-extinguishing permanent magnets for stretching the arc generated between the first fixed contact and the first movable contact, and between the second fixed contact and the second movable contact, A rotation restricting means is provided near the movable contact support portion to restrict the rotation of the movable contact as it moves forward and backward. The movable contact support portion is, A resin contact support fixed to one end of the movable plunger, A spring retainer is fixed to the contact support, with the top plate portion and a pair of legs extending parallel from both ends of the top plate portion. The device comprises a contact spring positioned inside the spring retainer, which biases the longitudinal center of the movable contact towards the top plate, The electromagnet unit comprises an excitation coil that generates a magnetic force by being excited to drive the movable plunger, and an excitation yoke surrounding the excitation coil. The electromagnetic contactor is characterized in that the rotation restricting means comprises a flat metal sliding portion fixed to the side surface of the contact support along the direction of rotation, and a flat metal rotation restricting portion fixed to the excitation yoke and positioned opposite the sliding portion.

2. The electromagnetic contactor according to claim 1, characterized in that four of the sliding parts are fixed to the four sides of the contact support, and four of the rotation restricting parts, on which each of the four sliding parts slide, are fixed opposite each other to the excitation yoke.

3. The electromagnetic contactor according to claim 2, characterized in that the four sliding parts are integrally formed with the main body, and the main body is fixed to the movable plunger.

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