Motor Circuit Breaker for Overload & Short Circuit Protection | UL/CE Certified

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Motor Circuit Breaker: Overload and Short Circuit Protection for Motors

Motor Circuit Breaker: Overload and Short Circuit Protection for Motors

The motor circuit breaker is a protective device for motor circuits, automatically cutting off power during overload, short circuit, or phase loss faults to protect motors and connected equipment. It combines overcurrent protection and manual switching functions, featuring rapid tripping and reliable operation. Commonly installed in motor control cabinets, pumps, and compressors, this breaker ensures safe motor operation, reduces maintenance costs, and prevents equipment damage from electrical faults.
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Advantages

Quick-Reset Mechanism

Manual reset within 5 seconds after fault clearing, reducing downtime compared to fuses or traditional circuit breakers.

Phase Loss Detection

Automatically trips when any phase is lost, preventing motor burnout from single-phasing in three-phase systems.

Compact Motor Mounting

Din rail or surface mounting options, suitable for integrated installation in motor starters and control cabinets.

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Motor circuit breakers are equipped with MCBs that protect motors from overload and short circuit with separate adjustment for thermal (0.7 - 1x FLC) magnetics (10 - 14x of rated current) trip units. Complying with UL 489, using them in pumps and fans that allow quick reset features. These have three pole models alongside the option to include phase loss protection.

Frequently Asked Questions

How does a motor circuit breaker protect against overloads?

A motor circuit breaker combines thermal-magnetic tripping: thermal elements detect overloads (1.1-1.5x rated current) and magnetic elements trigger instant shutdown for short circuits (10x rated current). This dual protection ensures comprehensive motor safety in electrical systems.
The motor circuit breaker features a quick-reset mechanism, allowing manual reset within 5 seconds after clearing the fault. This reduces downtime compared to fuses or traditional circuit breakers, improving operational efficiency in motor-driven equipment.
Yes, the motor circuit breaker automatically trips when any phase is lost in a three-phase system, preventing motor burnout from single-phasing. This critical feature protects motors in industrial applications like pumps, compressors, and conveyor systems.
The motor circuit breaker offers flexible mounting options, including DIN rail or surface mounting, suitable for integrated installation in motor starters and control cabinets. This versatility simplifies integration into new or existing motor control systems.
Yes, the motor circuit breaker is UL/CE certified, meeting international safety standards for use in global markets. This ensures compliance with local electrical codes and facilitates market access in Europe, North America, and other regions.
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Customer Reviews

Tom Baker
Trusted Protection for Industrial Motors

"As a motor repair shop, we recommend these circuit breakers to the clients. The thermal-magnetic tripping mechanism provides dual protection against overloads and short circuits, which is crucial for older motors prone to electrical faults. The UL/CE certification gives our clients confidence in safety compliance, and the screwless terminals make installations faster for their maintenance teams. Haven't had a single return due to breaker failure—highly reliable."

Lisa Moore
Efficient Motor Circuit Breaker with Quick Response

This motor circuit breaker offers fast response times and reliable protection. It accurately detects faults and cuts off the circuit immediately, minimizing downtime and potential damage. The simple design and high-quality materials ensure long-lasting performance. Highly useful for maintaining the safety of our electrical systems.

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UL/CE Certified Safety

UL/CE Certified Safety

Meets international safety standards for use in global markets, ensuring compliance with local electrical codes.
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Yueqing Huilong provides advanced industrial control appliances and relays for global markets. Our ISO-9001 certified products ensure quality and reliability. Contact us today!

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No. 3789 Liujiang Road, Liushi Town,Yueqing City, Wenzhou City, Zhejiang Province, 325604

+86-18155034103

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