A plug-in circuit breaker

By designing a standardized plug-in circuit breaker and combining multiple mechanisms and electromagnetic trip units, the shortcomings of existing plug-in circuit breaker design and performance have been solved, achieving stable and reliable circuit control and a simplified structure to meet the needs of different users.

CN112750667BActive Publication Date: 2026-07-24BEIJING MINGRI ELECTRICAL EQUIP
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Patent Information

Application Number
CN202110237354.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-03-03
Publication Date
2026-07-24
Estimated Expiration
2041-03-03

AI Technical Summary

Technical Problem

Existing plug-in circuit breakers suffer from issues in design and performance, including low standardization of components, unstable performance, and a variety of models that fail to meet evolving application requirements.

Method used

A highly standardized plug-in circuit breaker was designed, including a housing, an incoming line mechanism, an outgoing line mechanism, a manual operating mechanism, an electric operating mechanism, a contact actuation mechanism, an arc extinguishing mechanism, and an overload and short-circuit protection mechanism. Different electromagnetic trip units and current transformers are used, combined with an electric operating mechanism and a closing/opening display mechanism, to achieve stable and reliable circuit control.

Benefits of technology

It improves the standardization of plug-in circuit breakers, saves production costs, enhances the convenience of user operation and maintenance, ensures the stable performance of circuit breakers under both low and high current specifications, simplifies the structure, and improves short-circuit protection performance.

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Abstract

The invention relates to a plug-in circuit breaker, which comprises a shell, an inlet and outlet mechanism, a manual and electric operating mechanism, a contact operating mechanism, an overload and short circuit protection mechanism, the manual operating mechanism comprises a manual handle, a display mechanism and a locking mechanism, the electric operating mechanism comprises a closing motor, a tripping electromagnet and a PCB control board, the invention has high standardization, more general parts, saves production cost, facilitates the use and maintenance of users, and adopts multiple technologies, such as the outlet mechanism, the wire pressing plate can not only apply an upward pressure to the external wire, but also apply a reverse force to prevent the external wire from sliding out, so that the external wire is not easy to fall off, the design of the manual handle makes the tripping and closing display mechanism and the locking mechanism simple in structure and reliable in work, in the electric operating mechanism, the closing and tripping are systems, and do not interfere with each other, in the short circuit protection, different electromagnetic release devices are selected according to the current specifications, so that the short circuit protection performance of the circuit breaker is improved.
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