Product Description
The UL489-listed 140U-K6D3-D12 circuit breaker, part of the 400A K-Frame family, is a 3-pole molded case circuit breaker designed for thermal overload and short-circuit protection in industrial control panels. Offering high interrupting ratings in a compact design, it's suitable for back-feeding at 240/480VAC and applications like branch circuit protection, small cabinets, distribution panels, control circuits, HACR, and high-intensity discharge lighting. It features a 100kA interrupting rating at 480VAC, a 120A maximum trip rating, and operates within a 240-600VAC range. With a 70V insulation voltage and 6kV withstand rating, it includes a thermal-magnetic trip unit providing overload and instantaneous overcurrent protection. The thermal trip is fixed at 125A, while the magnetic trip is adjustable from 625A to 1250A. It features standard screw terminals, an open enclosure, and operates between -8 to 60 degrees Celsius up to 2000 meters in altitude.
Is Your Device Showing These Signs?
The Allen Bradley 140U-K6D3-D12 molded case circuit breaker commonly experiences issues such as nuisance tripping due to incorrect overload settings or thermal magnetic calibration drift. Failed short-circuit protection mechanisms, specifically the instantaneous trip unit, require repair or replacement. Contact wear and degradation on the line and load side terminals cause connection failures and elevated resistance. Internal component failures within the breaker's electronic trip unit, including the microprocessor or current sensors, necessitate comprehensive testing and component-level repair. Routine maintenance includes inspection for physical damage, verification of proper operation, and replacement of worn or damaged parts to ensure optimal performance and prevent downtime.
Technical specifications
The UL489-listed 140U-K6D3-D12 is a 400A K-Frame 3-pole circuit breaker designed for industrial control panels. It provides thermal overload and short-circuit protection with high interrupting ratings in a compact size. It's suitable for back-feeding and various applications, including branch circuit protection and lighting. Key specs include a 100kA interrupting rating at 480VAC, a 120A maximum trip rating, a 240-600VAC operating range, and a thermal-magnetic trip unit with a fixed 125A thermal trip and adjustable 625-1250A magnetic trip. It also features standard screw terminals and is designed for open enclosures, operating within a specified temperature and altitude range.
Our Repair Process for the
140U-K6D3-D12
Our repair process for the Allen Bradley 140U-K6D3-D12 molded case circuit breaker begins with a thorough inspection for physical damage and verification of proper operation. We address nuisance tripping by correcting overload settings and recalibrating the thermal magnetic components. Failed short-circuit protection mechanisms, specifically the instantaneous trip unit, are repaired or replaced. Contact wear and degradation on the line and load side terminals are resolved by cleaning, repairing, or replacing the affected terminals to ensure proper connection. Internal component failures within the breaker's electronic trip unit, including the microprocessor or current sensors, undergo comprehensive testing and component-level repair. The final step involves replacing worn or damaged parts to ensure optimal performance and prevent downtime.
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.