WEG RW27-2D3-U010 - OVERLOAD RELAY BU RW27-2D3-U010
WEG

RW27-2D3-U010

Alternate Item Number: 12140450

UPC: 7909018607450

Contact for Pricing

Overview

The WEG RW27-2D3-U010 thermal overload relay is a 2-pole bi-metallic device designed for motor protection in industrial applications. Rated for 32-40A current range, this relay provides Class 10 trip characteristics to safeguard motors from sustained overcurrent conditions. It features phase loss and current unbalance sensitivity protection, ensuring comprehensive safeguarding against common motor failure modes including single-phasing and unbalanced supply conditions. The relay includes isolated 1NO and 1NC auxiliary contacts for flexible control and monitoring applications. Designed for direct mounting under WEG contactors (e.g., CWB9-38 series), it eliminates the need for additional accessories and simplifies installation. Compatible with IEC 60947-4-1 and UL 508 standards, this relay is ideal for heavy-duty industrial environments such as manufacturing, mining, oil and gas, water treatment, and HVAC systems. The adjustable trip settings allow precise matching to the motor's full load amperage, providing customized protection for a wide range of applications. Part of WEG's RW series, this relay is engineered for seamless integration with WEG contactors to form a complete motor starter solution.
  • 2-pole thermal overload relay for motor protection (32-40A range)
  • Class 10 trip characteristics for rapid response to overload conditions
  • Phase loss and current unbalance sensitivity protection
  • Direct mounting under WEG contactors (e.g., CWB9-38 series) for simplified installation
  • Isolated 1NO and 1NC auxiliary contacts for flexible control and monitoring
  • Adjustable trip settings for customized motor protection
  • Compliant with IEC 60947-4-1 and UL 508 standards
  • Robust bi-metallic design for extended operational service life

Specifications

Current Rating
32-40A
Mounting Type
Direct mounting under WEG contactors
Poles
2
Series
RW
Package Weight (Imperial)
0.363 LB
Power supply for DIN-rail

PS-60

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

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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

What is the current rating range for the RW27-2D3-U010?

The current rating range for the RW27-2D3-U010 is 32 to 40 amperes.

What trip class does the RW27-2D3-U010 use?

The RW27-2D3-U010 uses Class 10 trip characteristics, providing rapid response to overload conditions.

Is the RW27-2D3-U010 compatible with WEG contactors?

Yes, the RW27-2D3-U010 is designed for direct mounting under WEG contactors, such as the CWB9-38 series.

Does the RW27-2D3-U010 protect against phase loss?

Yes, the relay includes phase loss sensitivity protection to safeguard motors against single-phasing conditions.

What auxiliary contacts are included in the RW27-2D3-U010?

The relay includes isolated 1NO (normally open) and 1NC (normally closed) auxiliary contacts for control and monitoring.

What standards does the RW27-2D3-U010 comply with?

The RW27-2D3-U010 complies with IEC 60947-4-1 and UL 508 standards for industrial reliability and safety.

Can the RW27-2D3-U010 be used for single-phase applications?

Yes, the RW27-2D3-U010 is a two-pole thermal overload relay designed for single-phase applications.

What is the mounting type for the RW27-2D3-U010?

The RW27-2D3-U010 features direct mounting under WEG contactors, with accessories available for separate mounting.

How to Install the WEG RW27-2D3-U010 Thermal Overload Relay

Step-by-step guide to install the WEG RW27-2D3-U010 thermal overload relay under a WEG contactor.

Estimated time: 20m

Tools needed:

Screwdriver, Wire strippers, Multimeter

Supplies needed:

Mounting screws, Compression lugs (if required)

  1. Prepare the contactor

    Ensure the WEG contactor (e.g., CWB9-38) is de-energized and isolated from power.

  2. Mount the overload relay

    Align the RW27-2D3-U010 with the contactor's mounting points and secure it using the provided screws.

  3. Connect the motor leads

    Route the motor leads through the relay's terminals and secure them with compression lugs or terminal screws.

  4. Wire the auxiliary contacts

    Connect the 1NO and 1NC auxiliary contacts to the control circuit as required for your application.

  5. Set the trip current

    Adjust the trip setting to match the motor's full load amperage using the relay's dial or selector.

  6. Verify installation

    Re-energize the system and verify proper operation using a multimeter to confirm correct current flow and relay response.

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.