Product Description
The Allen-Bradley 140U-K0X3 is a UL-listed, cost-effective, and compact 3-pole K-frame molded case circuit breaker designed for industrial control panel applications requiring short-circuit and overload protection. Suitable for back-feeding at 240-480VAC, it's ideal for distribution panels, feeder circuits, small cabinets, HVACR, and HID lighting. This 480VAC, 400A frame breaker has interrupting ratings of 100kA at 480VAC and 200kA at 240VAC, supporting circuits from 240-600VAC with a 6000V impulse withstand. It offers an electrical lifespan of 10,000 operations and a mechanical lifespan of 100,000 operations. While it doesn't include a factory-installed protection unit, it supports thermal/magnetic and electronic trip units, internal control modules (auxiliary, alarm, undervoltage, shunt trip), and a variety of field-installable external accessories. It's rated for use within control panel enclosures in temperatures ranging from -8 to 60 degrees Celsius.
Is Your Device Showing These Signs?
The Allen Bradley 140U-K0X3 molded case circuit breaker commonly experiences issues such as nuisance tripping due to incorrect overload settings or sensitivity to inrush current. Terminal connections loosen over time, leading to increased resistance and thermal overload. Internal component degradation, including the thermal trip unit and magnetic trip element, causes breaker failure. Calibration drift affects the accuracy of the trip curve, resulting in premature or delayed tripping. Environmental factors like humidity and temperature fluctuations accelerate corrosion and insulation breakdown, compromising the breaker's functionality and safety.
Technical specifications
The Allen-Bradley 140U-K0X3 is a compact and cost-effective 3-pole circuit breaker for industrial control panels, providing short-circuit and overload protection. It's suitable for back-feeding at 240-480VAC and ideal for various applications like distribution panels and HVACR. It's a 400A frame breaker with high interrupting ratings and a 6000V impulse withstand, offering a long operational lifespan. While it lacks a factory-installed protection unit, it supports various trip units, internal control modules, and field-installable accessories, and operates in temperatures from -8 to 60 degrees Celsius.
Our Repair Process for the
140U-K0X3
Our repair process for the Allen Bradley 140U-K0X3 molded case circuit breaker begins with a comprehensive visual inspection for physical damage, corrosion, and loose connections. We then perform electrical testing to assess the breaker's insulation resistance, contact resistance, and trip characteristics against the manufacturer's specifications. If discrepancies are found, the breaker undergoes disassembly, cleaning, and component-level inspection. Faulty components, such as the thermal trip unit, magnetic trip element, or internal wiring, are replaced with new, original equipment manufacturer (OEM) parts. Terminal connections are tightened and re-torqued to the specified values. The breaker is then recalibrated to ensure accurate trip curve performance. Finally, the repaired breaker undergoes rigorous testing to verify its functionality and safety before being returned to service.
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.