Product Description
The Allen-Bradley 140U-LTD3-D30 is a 300A, thermal-magnetic trip unit (rating plug) for 600A Frame L MCCBs, offering thermal overload, short circuit, and ground fault protection for industrial power distribution and DC networks. It features an adjustable magnetic trip range of 1500-3000A for instantaneous tripping, using a bimetallic strip for overload detection and magnetic force for short circuit unlatching. This electromechanical unit automatically opens the circuit in overcurrent situations, protecting equipment in applications like generator circuits and motor control. Note that its current carrying capacity decreases above 40C, potentially causing nuisance tripping. For safe installation, ensure the circuit breaker handle is in the "tripped" or "off" position before removing the cover.
Is Your Device Showing These Signs?
The Allen Bradley 140U-LTD3-D30 molded case circuit breaker commonly experiences issues such as nuisance tripping due to incorrect overload settings or thermal magnetic trip unit malfunction. Corrosion on the line and load side terminals impedes proper electrical connections, leading to voltage drops and overheating. Internal component failure within the breaker mechanism prevents proper operation and requires replacement. Diagnostic testing, including insulation resistance testing and ductor testing, identifies these faults. Replacement of the breaker or individual components resolves these issues.
Technical specifications
The Allen-Bradley 140U-LTD3-D30 is a 300A rating plug for 600A Frame L MCCBs, providing thermal overload, short circuit, and ground fault protection in industrial power systems. It uses a bimetallic strip for overload detection and magnetic force for instantaneous tripping (adjustable from 1500-3000A). It automatically trips the circuit in overcurrent situations. Its current carrying capacity decreases above 40C, and safe installation requires the circuit breaker to be in the "tripped" or "off" position before removing the cover.
Our Repair Process for the
140U-LTD3-D30
Our repair process for the Allen Bradley 140U-LTD3-D30 molded case circuit breaker begins with comprehensive diagnostic testing, including insulation resistance and ductor testing, to pinpoint the source of malfunction. Identified issues such as nuisance tripping from incorrect overload settings, thermal magnetic trip unit malfunction, or corrosion on line and load side terminals are addressed. Correct overload settings are implemented, corroded terminals are cleaned or replaced to ensure proper electrical connections, and any internal component failures within the breaker mechanism necessitate replacement of the breaker or specific components to restore proper operation.
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