Electromagnetic contactor

The electromagnetic contactor addresses the issue of deteriorated arc extinction performance due to metal vapor generation by using a unique arc-extinguishing wall design with separate spaces for vapor flow, effectively enhancing the contactor's reliability during high-current operations.

JP2025043045APending Publication Date: 2025-03-28FUJI ELECTRIC CO LTD
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Patent Information

Application Number
JP2023150339
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-09-15
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

In electromagnetic contactors, when a large current is cut off, the generation of metal vapor between the fixed and movable contacts can lead to increased pressure and airflow that hinders arc extinction, resulting in deteriorated arc extinction performance.

Method used

The electromagnetic contactor incorporates a box-shaped arc-extinguishing wall with arc-extinguishing permanent magnets and magnetic pole plates, which creates separate arc-extinguishing spaces and outer communication spaces. This design allows metal vapor to flow through these spaces, away from the arc extinguishing areas, thereby preventing pressure buildup and enhancing arc extinction efficiency.

Benefits of technology

This configuration effectively prevents the degradation of arc extinction performance even when large amounts of metal vapor are generated, by ensuring that the vapor is directed away from the arc extinguishing spaces, thus improving the reliability of the contactor during high-current operations.

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Abstract

To provide an electromagnetic contactor which is prevented from degrading in arc extinguishing performance even when a large amount of metal vapor is generated when breaking a large current.SOLUTION: An electromagnetic contactor comprises: a box-shaped arc-extinguishing wall 35 that is arranged inside a storage case 6 and houses a pair of fixed contacts 3a, 3b and a movable contact 4; first and second arc-extinguishing spaces S1, S2 surrounded by the arc-extinguishing wall and provided on one and the other sides of the longitudinal direction of the movable contact; a pair of arc-extinguishing permanent magnets 36, 37 arranged opposite to each other for extending a first arc generated between the first fixed contact and the first movable contact into the first arc-extinguishing space and for extending a second arc generated between the second fixed contact and the second movable contact into the second arc-extinguishing space, first openings 40a, 40b provided in the wall portion of the arc-extinguishing wall in the direction in which the first arc is extended, and second openings 40c, 40d provided in the wall portion of the arc-extinguishing wall in the direction in which the second arc is extended.SELECTED DRAWING: Figure 4
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