Improved operating device for low-voltage air circuit breaker

The improved low-voltage air circuit breaker device with a stepper motor and mechanical linkage addresses undervoltage trip coil burnout and enables forced locking, ensuring reliable operation and compliance with regulatory interlocking requirements.

TWI934403BActive Publication Date: 2026-08-01陈锡瑜
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Patent Information

Application Number
TW113151719
Authority / Receiving Office
TW · TW
Patent Type
Patents
Current Assignee / Owner
Filing Date
2024-12-31
Publication Date
2026-08-01
Estimated Expiration
2044-12-30

AI Technical Summary

Technical Problem

Conventional low-voltage air circuit breakers suffer from undervoltage trip coil burnout due to continuous energization, leading to internal tripping mechanism damage and inability to perform forced locking, which hinders market demands for mandatory closing and long-distance interlocking functions.

Method used

The device incorporates a power supply unit, electrical operation control unit, manual operation restriction unit, and external command unit, utilizing a stepper motor to replace the undervoltage trip coil, and includes mechanical linkage devices to enforce forced start/stop and closing functions, preventing burnout and accidental energization.

Benefits of technology

The solution ensures reliable forced starting, closing, and locking of the air circuit breaker, addressing regulatory requirements and market needs for mandatory closure and long-distance interlocking, enhancing safety and reliability.

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Abstract

This invention provides an improved low-voltage air circuit breaker operation device that addresses the shortcomings of conventional low-voltage air circuit breakers. In these devices, the undervoltage trip coil burns out due to continuous energization, causing the internal tripping mechanism to lock up and become damaged, thus preventing forced locking. If a tripping mechanism is used, forced locking may occur, potentially leading to accidental energization. This prevents the low-voltage air circuit breaker from being forced to close, hindering market demand. The improved low-voltage air circuit breaker operation device comprises a power supply unit, an electrical operation control unit, a manual operation restriction unit, and an external command unit. The microprocessor of the electrical operation control unit operates normally for starting and closing according to its programmed settings. The manual operation restriction unit replaces the traditional undervoltage coil, preventing burnout from prolonged energization and enabling forced starting and closing, effectively preventing accidental energization and disconnection.
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