Short circuit protection mechanism and stationary contact assembly, plug-in circuit breaker and circuit breaker

By mounting the stationary contact on the upper surface of the magnetic yoke in the circuit breaker and adjusting the tilt angle of the coil frame, the internal structure of the circuit breaker is optimized, solving the problem of excessive size of plug-in circuit breakers and achieving a reduction in circuit breaker length and effective use of space.

CN224537033UActive Publication Date: 2026-07-21ZHEJIANG CHINT ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ZHEJIANG CHINT ELECTRIC CO LTD
Filing Date
2025-06-25
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

The short-circuit protection mechanism and stationary contact assembly of existing plug-in circuit breakers occupy a large space, making it difficult to reduce the size of the circuit breaker and failing to meet the installation requirements of electrical equipment.

Method used

The stationary contact is mounted on the upper surface of the magnetic yoke, and the space occupied by the short-circuit protection mechanism and stationary contact assembly is reduced by adjusting the tilt angle and layout design of the coil frame, thereby optimizing the internal structure of the circuit breaker.

Benefits of technology

This effectively reduces the length and volume of the circuit breaker, shortening its length to 70mm-75mm, meeting the installation requirements of electrical equipment and providing more space for component layout.

✦ Generated by Eureka AI based on patent content.

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Abstract

A short-circuit protection mechanism and a static contact assembly, a plug-in circuit breaker and a circuit breaker, comprising a short-circuit protection mechanism and a static contact fixedly installed on the short-circuit protection mechanism, the short-circuit protection mechanism comprising a magnetic yoke, a moving iron core, a static iron core, a coil framework and a coil, the coil being wound on the coil framework, the coil framework being connected to the magnetic yoke, the moving iron core and the static iron core being located inside the coil framework, the magnetic yoke comprising oppositely arranged first and second magnetic yoke side plates, the coil framework being installed on the first and second magnetic yoke side plates, the moving iron core being provided with a driving portion extending out of the coil framework and extending to the outside of the first magnetic yoke side plate away from the second magnetic yoke side plate, the outside of the first magnetic yoke side plate away from the second magnetic yoke side plate being an upper surface of the magnetic yoke, the static contact being installed on the upper surface of the magnetic yoke, the static contact comprising a contact portion cooperating with a moving contact, a projection of the contact portion along the coil axis being at least partially located on the upper surface of the magnetic yoke, so that the structure of the circuit breaker is compact.
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