Product Description
The Allen-Bradley 140U-K6G3-D40 is a 3-pole, 400 Amp molded case circuit breaker (MCCB) designed for global applications, providing electronic LSG protection (Long, Short, Ground Fault) for circuits against short-circuits, ground faults, and overloads in bus-bar trunking tap-offs, switchboards, panelboards, and individual enclosures. It operates at 480 Volts with a 65 kA interrupting rating and features factory-assembled internal control modules: Undervoltage Release (UVT) and Shunt Trip (SNT) on the left, and Auxiliary Contact (AX), Alarm Contact (AL), and Auxiliary/Alarm Contact (AX/AL) on the right. External accessories include terminal shields, operating mechanisms, end cap kits, phase barriers, and mounting hardware. Certified by CCC, CE Mark, CSA, and UL, it's compatible with IE3 Motors (IEC 60034-30) and approved by IEC, CSA, CCC, and UL for its interrupting capacity. It has a storage temperature range of -40 to 176F (-40 to 80C), a maximum ambient temperature rating of 104F (40C) without derating, and compact dimensions of 140 x 108.5 x 205 mm.
Is Your Device Showing These Signs?
The Allen Bradley 140U-K6G3-D40 molded case circuit breaker commonly experiences issues such as nuisance tripping due to incorrect overload settings or thermal magnetic calibration drift. Field failures often stem from contact erosion caused by repetitive high fault current interruptions or improper torque on terminal connections leading to resistive heating and eventual breaker failure. Internal component degradation, specifically the solid-state trip unit, can also manifest as erratic behavior or a complete inability to reset after a fault. Replacement of the entire breaker is frequently required when these conditions are present.
Technical specifications
The Allen-Bradley 140U-K6G3-D40 is a 400 Amp, 3-pole circuit breaker (MCCB) offering electronic LSG protection against short-circuits, ground faults, and overloads in various electrical installations. It operates at 480V with a 65kA interrupting rating and includes factory-installed UVT, SNT, AX, AL, and AX/AL control modules. It's certified by multiple international standards (CCC, CE, CSA, UL), compatible with IE3 motors, and features a wide storage temperature range. It also has available external accessories and compact dimensions.
Our Repair Process for the
140U-K6G3-D40
Our repair process for the Allen Bradley 140U-K6G3-D40 molded case circuit breaker begins with a thorough inspection to diagnose the root cause of the malfunction, focusing on common issues such as nuisance tripping, contact erosion, and internal component degradation. Overload settings and thermal-magnetic calibration are verified against manufacturer specifications. Terminal connections are assessed for proper torque and signs of resistive heating. If contact erosion or internal component failure within the solid-state trip unit is evident, replacement of the entire breaker is mandatory to ensure operational reliability and safety.
Your Guarantee: Warranty & Lifetime Support
Your satisfaction is our top priority, and we confidently stand behind the quality of our repairs. That's why every repair service is covered by our comprehensive 24-month warranty. Furthermore, we offer lifetime phone support – if you have questions or need assistance related to our repair down the road, we're here to help. Our service commitment is straightforward: we guarantee our work, and if you're not satisfied, we will make it right. Learn More about our Repair process.
Comprehensive Repairs You Can Depend On
We take immense pride in the quality and reliability of our work. Our process goes beyond simply fixing the immediate problem. We perform a comprehensive inspection of your main board (or other equipment) and proactively replace components known to be failure-prone or showing signs of potential future failure. Before any item is returned, it undergoes rigorous functional testing to ensure it meets performance specifications and operates flawlessly. Visit our main Repair Services page to learn more.
Save Significantly
Our primary goal is to save you hundreds, or even thousands, of dollars compared to the cost of new equipment replacement. By repairing existing components, we provide an economical solution that is also eco-friendly. At Roc Industrial, our commitment to integrity and community drives our consistent growth and ensures you receive a reliable, cost-effective solution.
Please Note: Roc Industrial operates as an independent service provider and is not an authorized distributor for the manufacturers or brands mentioned. Consequently, the original manufacturer's warranty is not applicable to items repaired or sold by us. Roc Industrial provides its own 2-year warranty on all repair services performed.
Buying Options
To receive a quote within 2 hours, please provide us with the details of your requirements. Our team will promptly review your request and send you a custom offer.
Ships from Rochester, NY