WEG RWM420E-3-A4U250 - OVERLOAD RELAY RWM420E-3-A4U250
WEG

RWM420E-3-A4U250

Alternate Item Number: 12802652

UPC: 7909158908288

Contact for Pricing

Overview

The WEG RWM420E-3-A4U250 Overload Relay is a critical component for ensuring the longevity and reliable operation of industrial electric motors. Designed to safeguard against the detrimental effects of sustained overcurrent, this thermal overload relay actively monitors the motor's current draw. When the current exceeds pre-set safe operational limits for an extended duration, the RWM420E-3-A4U250 initiates a trip sequence, effectively disconnecting power to the motor. This proactive protection mechanism is paramount in preventing catastrophic motor burnout and costly downtime. Distinguishing itself from circuit breakers, which primarily protect electrical wiring from short circuits and overloads, the WEG RWM420E-3-A4U250 is specifically engineered and calibrated to protect the motor windings from thermal damage. This precise calibration ensures that the relay responds to conditions that pose a direct threat to the motor's integrity, rather than simply protecting the downstream electrical infrastructure. The adjustable trip settings are a key feature, allowing maintenance professionals and engineers to precisely match the overload protection to the motor's specific full load amperage (FLA) requirements. This customization is vital for optimizing motor performance and preventing nuisance tripping while maintaining robust protection. Applications for the WEG RWM420E-3-A4U250 are widespread across various industrial sectors, including manufacturing plants, processing facilities, water treatment operations, and any environment where electric motors are integral to production. It is commonly integrated into motor control centers (MCCs), pump stations, conveyor systems, and HVAC systems. The RWM420E-3-A4U250 is designed for seamless integration with WEG contactors and other motor control components, offering a comprehensive and reliable motor protection solution. Its robust construction and adherence to stringent quality standards, characteristic of WEG products, ensure dependable performance even in demanding industrial environments. Choosing WEG for motor protection signifies a commitment to quality, durability, and advanced engineering, providing peace of mind and operational efficiency. Key benefits include: * **Enhanced Motor Lifespan:** Prevents thermal degradation and premature failure. * **Reduced Downtime:** Minimizes unexpected production stoppages due to motor issues. * **Precise Protection:** Adjustable settings allow for tailored motor safeguarding. * **Cost Savings:** Avoids expensive motor repairs and replacements. * **Reliable Performance:** Built with WEG's reputation for quality and durability. The RWM420E-3-A4U250 is an essential investment for any facility prioritizing the protection and efficiency of its electric motor assets.
  • WEG RWM420E-3-A4U250 Thermal Overload Relay
  • Designed for industrial motor protection and control
  • Monitors motor current to prevent thermal damage
  • Adjustable trip settings for precise FLA matching
  • Ensures motor longevity and reduces downtime

Specifications

Series
RWM420E
Package Weight (Imperial)
5.544 LB

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.