WEG RWM840E-3-A4U840 - OVERLOAD RELAY RWM840E-3-A4U840
WEG

RWM840E-3-A4U840

Alternate Item Number: 11455847

UPC: 7891327193918

Contact for Pricing

Overview

The WEG RWM840E-3-A4U840 Overload Relay is a critical component for ensuring the longevity and reliable operation of industrial electric motors. Designed to safeguard motors against the detrimental effects of sustained overcurrent, this thermal overload relay acts as a vigilant guardian, continuously monitoring motor current draw. When the current exceeds predetermined safe operational limits for an extended duration, the RWM840E-3-A4U840 automatically trips the associated circuit, effectively interrupting power to the motor and preventing catastrophic damage such as burnout. Unlike circuit breakers, which are primarily engineered to protect electrical wiring from overcurrent faults, overload relays are specifically calibrated to protect the motor windings themselves from thermal stress. This precise calibration is essential, as motors have unique thermal characteristics and operating parameters. The WEG RWM840E-3-A4U840 offers adjustable trip settings, allowing for precise customization to match the specific full load amperage (FLA) of your motor. This ensures that the relay provides optimal protection without causing nuisance tripping during normal, albeit high, load conditions. Key features and benefits of the WEG RWM840E-3-A4U840 include: * **Advanced Thermal Protection:** Utilizes bimetallic elements to accurately detect and respond to prolonged overcurrent conditions, mimicking the thermal behavior of the motor. * **Adjustable Trip Settings:** Enables users to fine-tune the overload protection to the exact requirements of their motor, optimizing safety and operational efficiency. * **Wide Application Range:** Suitable for a broad spectrum of industrial motor control applications, including pumps, fans, conveyors, compressors, and general machinery across various sectors such as manufacturing, water treatment, and material handling. * **Enhanced Motor Lifespan:** By preventing thermal damage, this relay significantly extends the operational life of electric motors, reducing costly downtime and replacement expenses. * **Reliable WEG Manufacturing:** Backed by WEG's reputation as a global leader in motor and drive technology, ensuring robust construction and dependable performance in demanding industrial environments. Installation of the RWM840E-3-A4U840 is typically straightforward, often integrated within motor starter assemblies or control panels. Proper selection and setup are paramount; engineers and technicians must consult motor nameplate data and application requirements to set the overload relay's trip current accurately. The RWM840E-3-A4U840 is designed for integration with WEG contactors and other motor control components, offering a comprehensive solution for motor protection. Its robust design ensures reliability even in harsh industrial settings, contributing to overall plant safety and productivity. Investing in a high-quality overload relay like the WEG RWM840E-3-A4U840 is a proactive measure that safeguards critical assets and minimizes operational disruptions.
  • WEG RWM840E-3-A4U840 Thermal Overload Relay for industrial motor protection.
  • Prevents motor burnout by detecting sustained overcurrent conditions.
  • Adjustable trip settings for precise motor full load amperage (FLA) matching.
  • Designed for reliable operation in demanding industrial environments.
  • Enhances motor lifespan and reduces costly downtime.

Specifications

Series
RWM840E
Package Weight (Imperial)
9.13 LB

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Frequently Asked Questions about WEG

What certifications and standards do WEG products comply with?

WEG products meet extensive international standards across multiple critical categories, including safety, electromagnetic compatibility (EMC), functional safety, and regulatory compliance. Key certifications include UL, cUL, CE, TÜV Rheinland, and compliance with international standards such as EN 61800 series, IEC 61508, ISO 13849-1, and directives like Low Voltage (2014/35/EU), EMC (2014/30/EU), and RoHS. Their products are certified for safe operation in various industrial environments, with specific standards covering electrical safety, thermal performance, electromagnetic immunity, and environmental protection.

What is WEG's warranty policy?

WEG offers an 18-month standard warranty for automation products, covering defects in workmanship and materials. The warranty requires proper transportation, handling, storage, and installation within specified environmental conditions. Repairs must be performed by authorized WEG service, and the warranty is limited to the replacement or repair of the product itself, excluding consequential damages. Extended warranty options are available, including purchasing additional coverage at 2.5% of the product's selling price per year, up to 4 additional years.

What industries and applications are WEG products used for?

WEG products are extensively used across multiple industrial sectors, including packaging equipment, material handling, food processing, pumps, medical/lab equipment, door/gate openers, office machinery, and lawn/garden applications. Their versatile DC motors and variable frequency drives (VFDs) are designed for general industrial use, with solutions ranging from off-the-shelf products to custom OEM designs that meet UL/CSA standards for diverse manufacturing and processing environments.

What technical support does WEG offer?

WEG offers comprehensive technical support through multiple channels, including a dedicated Automation Service Department accessible via toll-free phone (1-877-934-3748) and email ([email protected]). They maintain a global network of accredited service centers worldwide, which customers can locate on their website. Additionally, WEG provides warranty support and technical assistance for their industrial automation products, with pre-approval required for warranty repairs.

What are the key features of WEG products?

WEG products feature advanced industrial automation technologies with key characteristics including high performance, flexibility, and connectivity. Their flagship CFW900 Variable Speed Drive demonstrates core product strengths: intelligent thermal management, built-in safety functions, IoT readiness, advanced energy saving capabilities, and comprehensive communication protocols. WEG drives offer robust performance with features like 150% overload capacity, modern graphic HMI, plug-and-play expansion modules, and compatibility across multiple industrial segments including food and beverage, pulp and paper, and manufacturing.

What communication protocols do WEG products support?

WEG products support multiple industrial communication protocols across their product lines, including EtherNet/IP, Modbus-TCP, Modbus-RTU, CANopen, and optional protocols like Profibus-DP and DeviceNet. Specifically, the PLC500 offers 2x Gigabit Ethernet Ports, 1x CAN Port, and 1x RS485 port, enabling seamless integration with major industrial communication networks.

What environmental ratings do WEG products have?

WEG products feature multiple environmental ratings and protection classes. They offer Protection Class 3C2 as a standard coating and Protection Class 3C3 as an optional extra coating, both compliant with IEC 60721-3-3. Environmental specifications include air relative humidity from 5% to 95% non-condensing, altitude ratings up to 1,000m standard (with current derating above that), and Pollution Degree 2 classification with non-conductive pollution requirements.

What accessories are available for WEG products?

WEG offers a comprehensive range of accessories across multiple product lines. For variable frequency drives like the CFW900, accessories include I/O expansion modules, communication modules, encoder modules, temperature transducer modules, relay output modules, and HMI accessories. These accessories expand communication capabilities, input/output functions, and application flexibility. Most accessories are interchangeable between drive frames and can be installed in backplane slots, with communication network accessories limited to one per variable speed drive.

What are the main product lines offered by WEG?

WEG offers a comprehensive range of industrial automation products, including variable frequency drives (CFW series like CFW100, CFW300, CFW500), soft starters (SSW series including SSW05, SSW07, SSW900), and the innovative Motion Fleet Management (MFM) system for predictive maintenance and asset monitoring. Their product lines are designed to support industrial automation needs across various sectors, providing solutions for motor control, fleet management, and operational efficiency.

How are WEG products typically installed?

WEG products are typically installed with careful attention to mounting specifications, protection ratings, and airflow requirements. For variable speed drives like the CFW900, installation methods include surface mounting, flange mounting, and side-by-side configurations with specific clearance guidelines. Installers must follow precise dimensional requirements for each product frame size, ensuring proper ventilation and electrical connections.