Key Product Data
Catalog Number: 140G-M5X3
Manufacturer: Allen-Bradley / Rockwell Automation
Product Family: Bulletin 140G
Component Type: Molded Case Circuit Breaker Frame
UPC: 885630443485
Frame Size: M-Frame
Rated Frame Current: 800 A
Number of Poles: 3
Interrupting Rating: 50 kA at 480 V AC
Adjustment Type: Frame Only
Protection Compatibility: Thermal-Magnetic / Electronic Trip Units
Standards: UL 489, CSA C22.2 No. 5, IEC
The Frame Is the Starting Point of the 140G Breaker Assembly
The Allen-Bradley 140G-M5X3 is an 800 A M-frame component from the Bulletin 140G molded case circuit breaker family. Its role is to provide the breaker frame for a compatible three-pole protection assembly.
An important distinction for procurement is that this catalog number identifies a frame-only product, not a fully configured circuit breaker. A suitable trip unit must be selected separately to establish the required protection characteristics and operating configuration.
For maintenance teams replacing an existing 140G assembly, identifying the frame and trip-unit combination is therefore more important than matching the frame catalog number alone.
Understanding the M5X3 Frame Designation
The 140G-M5X3 designation identifies an M-frame, three-pole breaker frame within the 140G family. Rockwell's product information specifies an 800 A frame rating and a 50 kA interrupting rating at 480 V AC.
The frame is part of a modular breaker arrangement in which the frame and trip unit combine to form the configured molded case circuit breaker.
This distinction affects both replacement planning and new assembly selection. The frame establishes the platform, while the compatible trip unit determines the protection functions and current settings available in the completed breaker.
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Electrical Capacity and Protection Configuration
Rockwell lists the 140G-M5X3 with a 50 kA interrupting rating at 480 V AC under the applicable UL 489/CSA product-rating table.
The 140G technical documentation also provides voltage-specific interrupting and breaking-capacity values for the M-frame family. These values vary by standard and operating voltage, so a single kA figure should not be applied to every installation.
The product page identifies thermal-magnetic and electronic protection as compatible protection types. The actual protection characteristics depend on the trip unit selected for the assembly.
Where This Frame Fits in Industrial Power Distribution
The 140G M-frame family is designed for higher-current industrial power distribution and circuit protection applications. An 800 A frame may be considered in equipment such as industrial distribution panels, larger motor-control assemblies and other three-phase power systems, subject to the completed breaker's rating and the installation design.
The frame-only configuration is particularly relevant when maintaining an existing 140G installation where the original frame remains the required platform and the trip unit is specified separately.
Frame-Only Purchasing: What Must Be Matched
Before ordering 140G-M5X3, check the complete breaker configuration rather than treating the frame as a standalone replacement for every 800 A breaker.
- Frame designation: Confirm the existing equipment requires an M-frame.
- Pole arrangement: This model is a three-pole frame.
- Frame current: Verify the 800 A frame requirement.
- Trip-unit compatibility: Identify the required thermal-magnetic or electronic trip unit.
- Interrupting capacity: Match the applicable voltage and fault-current requirements.
- Breaker assembly: Confirm the required accessories, connections and installation arrangement.
A frame with the correct current rating may still be unsuitable if its trip-unit combination or interrupting capacity does not meet the system requirements.
Frequently Asked Questions
What is Allen-Bradley 140G-M5X3?
It is an 800 A, three-pole M-frame molded case circuit breaker frame in the Allen-Bradley Bulletin 140G family.
Is 140G-M5X3 a complete circuit breaker?
No. Rockwell identifies it as a frame-only product. A compatible trip unit is required to complete the breaker assembly.
What is its interrupting rating?
The published UL 489/CSA rating is 50 kA at 480 V AC. Other voltage ratings must be checked against the relevant technical tables.
Which trip-unit types are compatible with this frame?
Rockwell lists thermal-magnetic and electronic protection options for the product family. The exact trip-unit selection must be verified against the 140G technical documentation.
What is the UPC for 140G-M5X3?
The UPC is 885630443485, which can be used alongside the catalog number for procurement identification.
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