Product Description
The Allen-Bradley 140U-LTD3-D40 trip unit, a thermal-magnetic protection device rated at 400 Amps, is designed for use with 600 Amp Frame L 3-pole MCCBs. It offers adjustable magnetic trip settings from 2000 to 4000 Amps for short circuit protection, along with ground fault and thermal overload protection. This electromagnetic switch, sensitive to current and temperature, automatically trips the breaker to protect equipment from short circuits and long-term overloads (lasting longer than 10 seconds), making it suitable for line distribution and cable protection. It also features a manual trip button. The trip unit's bimetallic strip and magnetic field activate the trip mechanism, opening the contacts upon detecting fault currents. Ensure proper installation of stationary interface barriers after installation with the breaker in the tripped position.
Is Your Device Showing These Signs?
The Allen Bradley 140U-LTD3-D40 Molded Case Circuit Breaker commonly experiences issues such as nuisance tripping due to thermal overload or magnetic instantaneous trip settings being too sensitive for the application. Field failures often stem from deteriorated internal components, requiring replacement to restore proper circuit protection. Corrosion on the line and load side terminals impedes current flow, causing resistive heating and potential fire hazards; thorough cleaning and re-torquing are mandatory. Verify proper coordination with upstream and downstream protective devices to prevent cascading failures and ensure selective tripping. Inadequate short-circuit current rating for the application's available fault current necessitates an upgrade to a breaker with a higher interrupting capacity.
Technical specifications
The Allen-Bradley 140U-LTD3-D40 is a 400 Amp thermal-magnetic trip unit for 600 Amp Frame L 3-pole MCCBs. It provides adjustable magnetic trip settings (2000-4000 Amps) for short circuit protection, as well as ground fault and thermal overload protection. It automatically trips the breaker to protect equipment from short circuits and long-term overloads, making it ideal for line distribution and cable protection. It also has a manual trip button and uses a bimetallic strip and magnetic field to activate the trip mechanism. Proper installation of stationary interface barriers after installation with the breaker in the tripped position is crucial.
Our Repair Process for the
140U-LTD3-D40
Our repair process for the Allen Bradley 140U-LTD3-D40 Molded Case Circuit Breaker begins with a comprehensive evaluation to pinpoint the cause of malfunction, focusing on nuisance tripping, sensitivity issues, and deteriorated internal components, which are replaced as needed. Terminals are meticulously cleaned to eliminate corrosion, and proper torque is applied to ensure optimal conductivity. Coordination with upstream and downstream protective devices is verified to guarantee selective tripping and prevent cascading failures. The breaker's short-circuit current rating is assessed against the application's available fault current; an upgrade to a higher interrupting capacity breaker is performed if necessary.
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
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Ships from Rochester, NY