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.

Compact Motor Mounting

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

Related products

MPCBs come equipped with thermal-magnetic trip units and electronic modules, as well as overload and short-circuit flags along with optional phase failure protection. Their terminals are quick connect and they provide fault indication. MPCBs are rated for three-phase systems up to 690V AC and are compliant with IEC 60947-2, using them in lifts and pumps/conveyors.

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."

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.