WEG MPW40-3-U020 - MOTOR PROTECTOR BU MPW40-3-U020
WEG

MPW40-3-U020

Alternate Item Number: 12428129

UPC: 7909158000357

Contact for Pricing

Overview

The WEG MPW40-3-U020 is a manual motor protector from WEG’s MPW Series, designed for 3-phase industrial motors up to 20A thermal setting. It meets UL Type-E self-protected combination starter requirements, combining disconnect, branch circuit protection, and overload protection in one compact device. Rated for 480V systems with 50kA short-circuit interruption capacity, it supports motors up to 15 HP at 460V and 20 HP at 575V. Engineered for compatibility with WEG contactors (CWC07–025, CWM9–40, CWB9–40), this protector is ideal for manufacturing, mining, and water treatment applications. UL File No. E172121 certified. Thermal setting range: 16–20A.
  • 20A thermal setting with adjustable range 16–20A
  • UL Type-E self-protected combination starter (UL File No. E172121)
  • 50kA short-circuit interruption capacity at 480V
  • Supports motors up to 15 HP at 460V and 20 HP at 575V
  • Compatible with WEG contactors CWC07–025, CWM9–40, CWB9–40

Specifications

Color
Blue
Connection Type
Screw Terminal
Current Rating
20 A
Frequency
50/60 Hz
Ip Rating
IP66/IP67
Material
Poly
Mounting Type
DIN Rail / Panel Mount
Nema Rating
Type 4X
Poles
3P
Series
MPW40
Voltage Rating
480 VAC
Package Weight (Imperial)
0.792 LB
MT-63 34A 3D SCREW EXP (MT63-3D-34-S-E)

1311001000

MT-63 34A 3D SCREW EXP (MT63-3D-34-S-E)
MT-63 19A 3D SCREW EXP (MT63-3D-19-S-E)

1311000700

MT-63 19A 3D SCREW EXP (MT63-3D-19-S-E)
One-hole, metric conductor, standard barrel with window lug, 4-6mm  wire, M8 stud hole.

LCMA6-8-C

One-hole, metric conductor, standard barrel with window lug, 4-6mm wire, M8 stud hole.
Copper One-Hole Lug, 45 Degree Bend Standard Barrel, Peep Hole, Max 35kV, Wire Size #1 AWG, 1/2 Inch Bolt Size, Silver Plated,Die Code 37, Die Color Code Green

54150UFSP

Copper One-Hole Lug, 45 Degree Bend Standard Barrel, Peep Hole, Max 35kV, Wire Size #1 AWG, 1/2 Inch Bolt Size, Silver Plated,Die Code 37, Die Color Code Green
CONTACT BLOCK BU BLB-02

BLB-02

CONTACT BLOCK BU BLB-02
CONTACT BLOCK BU BFB-40

BFB-40

CONTACT BLOCK BU BFB-40

Frequently Asked Questions

Is the MPW40-3-U020 UL certified?

Yes, it is UL Type-E self-protected combination starter certified (UL File No. E172121).

What is the thermal setting range for the MPW40-3-U020?

The thermal setting range is 16–20A.

What is the short-circuit interruption rating at 480V?

The short-circuit interruption rating is 65kA without CLT25.

What is the magnetic release current for the MPW40-3-U020?

The magnetic release current is 260A.

What motor horsepower does this protector support at 460V?

It supports motors up to 10 HP at 460V.

What contactors is this protector compatible with?

It is compatible with WEG contactors CWC07–025, CWM9–40, and CWB9–40.

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.