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Product Description
The Allen-Bradley 140M-K8P-D40 is a 400A, K-frame motor circuit breaker with a 35-65kA interrupting capacity at 480VAC, offering magnetic-only trip protection for motor loads and starters against overload, phase loss, and short circuits. Compliant with UL489, CE, CCC, CSA, and IEC/EN 60947 standards, it's suitable for machine control panels, motor control centers, and single-motor enclosed starters, providing overload protection for pumps, fans, and conveyors; a lockable actuator is needed for disconnection. Its compact design, shared accessories with the 140M-C/D/F series, and rotary variable-depth operating mechanism (NFPA79 compliant) offer flexibility. Benefits include current limiting to prevent oversizing in Type 2 coordination, eliminating separate overload relays for space and wiring savings, accurate magnetic trip settings for optimal motor protection, and a wide interrupting capacity range reducing the need for multiple product stocking, with field-installable accessories saving time and money.
Is Your Device Showing These Signs?
The Allen Bradley 140M-K8P-D40 motor protection circuit breaker commonly experiences issues such as nuisance tripping due to incorrect overload settings or inrush current miscalculations. Technicians often address problems with the magnetic trip unit failing to activate during short circuit events, requiring inspection and potential replacement. Thermal overload mechanisms degrade over time, leading to inaccurate thermal protection and necessitating recalibration or component replacement. Auxiliary contact failures are a frequent concern, impacting remote monitoring and control capabilities. Furthermore, ensure proper torque on terminal connections to prevent arcing and thermal damage, which contributes to premature failure of the breaker.
Technical specifications
The Allen-Bradley 140M-K8P-D40 is a 400A motor circuit breaker with magnetic-only trip protection and a 35-65kA interrupting capacity, compliant with multiple standards. It's designed for motor protection in various applications, offering space and cost savings through features like current limiting and eliminating separate overload relays. It also boasts a compact design, shared accessories, and field-installable options.
Our Repair Process for the
140M-K8P-D40
Our repair process for the Allen Bradley 140M-K8P-D40 motor protection circuit breaker begins with a thorough inspection to identify the root cause of the malfunction, focusing on common issues such as nuisance tripping, magnetic trip unit failures, thermal overload degradation, and auxiliary contact failures. Technicians verify overload settings and inrush current calculations to prevent future nuisance tripping. If the magnetic trip unit fails to activate during short circuit events, it undergoes inspection and replacement. Thermal overload mechanisms are recalibrated or replaced to ensure accurate thermal protection. Auxiliary contacts are tested and replaced as needed to restore remote monitoring and control capabilities. All terminal connections are tightened to the specified torque to prevent arcing and thermal damage, ensuring the breaker's reliable 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