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

Comprehensive Overload Protection

Combines thermal-magnetic tripping for overloads (1.1-1.5x rated current) and instant short-circuit protection (10x rated current), ensuring motor safety.

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.

Related products

Tailored motor circuit breakers are called motor protection circuit breakers for motor circuits. Overload releases have a thermal component that supports starting currents (for example: 6x rated current for 10s) for the motor. They are compliant with IEC 60898-1 (161-250 A frames) with dol starters and VFD systems for residential, industrial dual use applications.

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

Zhang Tianming
Quick Fault Recovery for Production Lines

"In our automotive parts factory, motor overloads used to shut down production for hours while we replaced fuses. These circuit breakers reset in seconds after a fault, getting our assembly line back up quickly. The phase loss protection saved our main conveyor motor from burnout during a recent power outage, and the compact size fit into our existing motor starters without rewiring. A vital upgrade for minimizing downtime."

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."

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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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