Product Description
The Allen-Bradley 140U-H3C3-D12 circuit breaker is a compact, 3-pole, 125-Amp Frame H circuit breaker with a thermal-magnetic trip unit, designed for overload and short-circuit protection in branch circuits and main circuits within enclosures, panelboards, and switchboards. Its wide interrupting range accommodates diverse applications, while field-installable accessories enhance flexibility and save time. Weighing 1.36 kg and measuring 5.5 x 3 x 3 inches, it operates between -8.9 and 60 degrees Celsius, offering breaking capacities from 30 to 39 kA. At 50 Hz, it provides varying ultimate and service breaking capacities at different AC voltages (220/240V, 380/415V, 525V, and 690V). Insulation voltage ratings (IEC 60947-2) are 690V AC for auxiliary circuits and 750V AC for main poles, with impulse withstand ratings of 4 kV and 6 kV, respectively. It dissipates up to 25 Watts of heat during normal operation.
Is Your Device Showing These Signs?
The Allen Bradley 140U-H3C3-D12 molded case circuit breaker commonly experiences issues such as nuisance tripping due to incorrect overload settings or thermal magnetic calibration drift. We address failures in the operating mechanism, preventing proper breaker actuation and reset. Terminal connection problems, including corrosion or loose connections, cause voltage drops and overheating, which are corrected through cleaning, tightening, or replacement. Internal component degradation, such as contact erosion or insulation breakdown, leads to reduced interrupting capacity and poses safety hazards; these necessitate comprehensive testing and component refurbishment or breaker replacement.
Technical specifications
The Allen-Bradley 140U-H3C3-D12 is a compact, 3-pole, 125A circuit breaker designed for overload and short-circuit protection in various electrical circuits. It features a thermal-magnetic trip unit, a wide interrupting range, and field-installable accessories. It's relatively small and lightweight, operates in a wide temperature range, and offers breaking capacities from 30 to 39 kA. It has different breaking capacities at various AC voltages at 50 Hz and specific insulation and impulse withstand voltage ratings. It also dissipates 25 Watts of heat during operation.
Our Repair Process for the
140U-H3C3-D12
Our repair process for the Allen Bradley 140U-H3C3-D12 molded case circuit breaker begins with a thorough inspection to diagnose issues such as nuisance tripping from incorrect overload settings or thermal magnetic calibration drift. We address failures within the operating mechanism that impede proper breaker actuation and reset. Terminal connection problems, including corrosion or loose connections, are corrected through meticulous cleaning, tightening, or component replacement to eliminate voltage drops and overheating. Internal component degradation, such as contact erosion or insulation breakdown, requires comprehensive testing, component refurbishment, or complete breaker replacement to restore interrupting capacity and ensure 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.