WEG RW407-2D3-U840 - OVERLOAD RELAY RW407-2D3-U840
WEG

RW407-2D3-U840

Alternate Item Number: 11557866

UPC: 7891327411838

Contact for Pricing

Overview

The WEG RW407-2D3-U840 thermal overload relay is a critical component in industrial motor protection systems, designed to safeguard motors from thermal damage caused by sustained overcurrent conditions. Unlike general-purpose circuit breakers that protect wiring infrastructure, this overload relay is specifically calibrated to protect the motor itself from overheating and potential burnout. Engineered by WEG, a global leader in industrial electric motor solutions, the RW407-2D3-U840 combines precision thermal sensing with adjustable trip settings to match your motor's full load amperage (FLA), ensuring optimal protection without unnecessary tripping. This thermal overload relay operates on the principle of bimetallic strip deflection, where excessive current causes the strip to bend and actuate the relay mechanism, disconnecting the motor from the power source. The adjustable trip range allows technicians to set the relay to trip at 100-125% of the motor's rated current, providing flexibility across different motor applications. The RW407-2D3-U840 is particularly suited for three-phase induction motors commonly found in manufacturing plants, HVAC systems, water pumping stations, and material handling equipment. Key applications include conveyor systems in food processing facilities, centrifugal pumps in chemical plants, and variable torque loads in mining operations. The relay's compact design and DIN-rail mounting compatibility make it ideal for control panels with space constraints, while its robust construction ensures reliable operation in harsh industrial environments with temperatures ranging from -25°C to +60°C. WEG's overload relays are trusted by maintenance engineers worldwide due to their consistent performance, long service life, and compliance with international standards such as IEC 60947-4-1 and UL 508. Professionals select the RW407-2D3-U840 based on several critical factors: the motor's service factor, ambient temperature conditions, and the type of load (constant vs. variable torque). Installation requires proper sizing of the relay to match the motor's FLA, correct wiring according to the motor's voltage rating (typically 200-600V AC), and adherence to local electrical codes. WEG provides comprehensive technical documentation and support to ensure proper selection and installation, including coordination charts that help engineers match overload relays with specific motor models. The RW407-2D3-U840's thermal overload protection is complemented by its ability to provide backup protection against phase loss and phase imbalance conditions, further enhancing motor reliability. Its manual reset feature allows for quick restoration of operations after a trip event, while the visible trip indicator simplifies troubleshooting. With over 70 years of experience in electric motor technology, WEG has established itself as a preferred supplier for industrial protection devices, offering products that deliver both performance and peace of mind in critical applications where motor failure could result in costly downtime. For maintenance teams seeking to extend motor life and reduce unplanned shutdowns, the WEG RW407-2D3-U840 thermal overload relay represents a proven solution that balances precision protection with operational flexibility. Its combination of WEG's engineering expertise, robust construction, and compliance with global standards makes it an essential component in any comprehensive motor protection strategy.
  • Thermal overload protection for three-phase induction motors
  • Adjustable trip range (100-125% of motor FLA) for precise protection
  • Compact DIN-rail mounting design for control panel integration
  • Phase loss and imbalance detection for enhanced motor safety
  • Compliant with IEC 60947-4-1 and UL 508 safety standards

Specifications

Mounting Type
DIN-Rail
Poles
3P
Series
RW407
Voltage Rating
200-600V AC
Package Weight (Imperial)
7.92 LB
Power supply for DIN-rail

PS-60

Power supply for DIN-rail
N3 SCREW COVER - 10X10X6 - GRA

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ACS380 AC Drive, 3-380-480V In, 3HP, 6A, Type OPEN, 1.5 overload, Integrated, HxWxD 6.69x2.76x7.52 in, Module

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BK63H 1P B2A 10kA 120/240VAC UL1077

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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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Pushbuttons. 104P heavy duty Oiltight Pushbutton. Nameplate. XN1B PR.No. CR100699

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General Electric Control Products. Nema Power Devices. Ol Relay 610F8364
C.BREAKER TMAX XT2N 125 UL/CSA FIXED THREE-POLE WITH FRONT TERMINALS AND THERMOMAGNETIC RELEASE TMA R 90 I3=450...900 A

XT2NU3090BFF000XXX

C.BREAKER TMAX XT2N 125 UL/CSA FIXED THREE-POLE WITH FRONT TERMINALS AND THERMOMAGNETIC RELEASE TMA R 90 I3=450...900 A
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.

NNC75X75WH2

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.
DS9 RECEPTACLE POLY BLUE SIZE 5 IP 66/67/69 3P+G 150 A 480 VAC 60 Hz

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HPS Open Style Control Transformer, 150VA 240x480V-120x240V 50/60Hz

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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.