WEG RWM420E-3-R4U420 - OVERLOAD RELAY RWM420E-3-R4U420
WEG

RWM420E-3-R4U420

UPC: 7909927461556

Contact for Pricing

Overview

The WEG RWM420E-3-R4U420 is a cutting-edge solid-state overload relay designed for robust industrial motor protection and control systems. Engineered with advanced technology to meet the most demanding global standards, this relay offers exceptional versatility and flexibility for manufacturers seeking to standardize their control panels. Its wide current adjustment range makes it suitable for protecting electric motors of various power ratings, simplifying inventory and design processes. This RWM-E series overload relay is specifically designed for direct mounting onto WEG CWM40 contactors (40A frame) and compatible with larger contactor frames up to 420A, forming reliable and integrated motor starter units. The solid-state design ensures precise and dependable operation, offering superior protection compared to traditional thermal overload relays. It actively monitors motor current and automatically trips the circuit when current exceeds safe operational levels for an extended period, effectively preventing motor burnout and costly downtime. Unlike circuit breakers, which primarily protect wiring, overload relays are meticulously calibrated to safeguard the motor itself from thermal damage. Key features of the WEG RWM420E-3-R4U420 include: * **3-Pole Solid State Design:** Provides comprehensive protection for three-phase motors. * **Adjustable Trip Classes:** Offers flexibility with selectable trip classes of 10, 20, and 30, allowing precise matching to motor characteristics and load requirements. * **Wide Adjustment Range (5:1):** The 85A to 420A adjustment range (specifically 4U420 in the WEG nomenclature) ensures compatibility with a broad spectrum of motor full-load amperages, enhancing standardization capabilities. * **Self-Powered Operation:** Eliminates the need for external control power, simplifying installation and reducing wiring complexity. * **Thermal Memory:** Retains thermal image of the motor, ensuring accurate protection even after power interruptions. * **Advanced Protection Features:** Includes built-in phase loss protection and phase unbalance protection, critical for preventing damage in demanding industrial environments. * **Temperature Compensation:** Operates reliably within a wide temperature range of -4 °C to +60 °C, suitable for diverse operating conditions. * **Multiple Reset Modes:** Supports manual (hand), automatic, and remote reset functionalities for operational flexibility. * **Integrated Auxiliary Contacts:** Features two independent built-in auxiliary contacts (1NO and 1NC) that ensure the motor is safely switched off upon failure detection, enhancing system safety. * **Direct Mounting Capability:** Designed for seamless, accessory-free direct mounting onto compatible WEG contactors, streamlining assembly and reducing installation time. The RWM420E-3-R4U420 is an ideal solution for a wide array of industrial applications, including pumps, fans, conveyors, compressors, and machine tools where reliable motor protection is paramount. WEG's commitment to quality and innovation ensures that this solid-state overload relay will provide long-lasting, dependable performance, safeguarding your valuable motor assets and optimizing operational efficiency. Its robust construction and advanced features make it a trusted choice for engineers and maintenance professionals in sectors such as manufacturing, processing, and automation.
  • WEG RWM420E-3-R4U420 3-Phase Solid State Overload Relay
  • Adjustable current setting: 85A - 420A (4U420)
  • Selectable Trip Classes: 10, 20, 30
  • Integrated Phase Loss and Phase Unbalance Protection
  • Self-powered, temperature compensated (-4°C to +60°C), with thermal memory
  • Manual, Automatic, and Remote Reset modes
  • Direct mounting to WEG contactors (CWM40 and compatible frames)
  • Includes 1NO and 1NC built-in auxiliary contacts

Specifications

Current Rating
85-420 A
Material
Solid State
Mounting Type
Direct Mounting
Poles
3-pole
Poles
3-Phase
Series
RWM-E
Package Weight (Imperial)
5.544 LB
Combine high performance with compact dimensions: - 1000 V AC / DC IEC 600 V UL, - Opt for the best marking visibility thanks to the up-front, flat marker zone, which lets you mark up to eight digits or increase the font size.

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The NNC75X75WH2 Halogen-Free Wide Slot Wiring Duct is used to route, protect, and manage wires near sensitive electronic equipment and in environments where heat resistance or public safety is a concern. UL 94 flame class of V-0 with a UL recognized continuous-use temperature up to 95 C (203 F). Halogen-Free, Polyphenylene Oxide (PPO). Mounting holes provided. 2.85" x 2.97" (72.4 mm x 75.4 mm) and 6.6' (2 m) long. Cover included. Color White. 5 pieces per package.

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The NNC75X75WH2 Halogen-Free Wide Slot Wiring Duct is used to route, protect, and manage wires near sensitive electronic equipment and in environments where heat resistance or public safety is a concern. UL 94 flame class of V-0 with a UL recognized continuous-use temperature up to 95 C (203 F). Halogen-Free, Polyphenylene Oxide (PPO). Mounting holes provided. 2.85" x 2.97" (72.4 mm x 75.4 mm) and 6.6' (2 m) long. Cover included. Color White. 5 pieces per package.
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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.