WEG UMBW-4D2-40 - MINI CIRCUIT BREAKER UMBW-4D2-40
WEG

UMBW-4D2-40

Alternate Item Number: 13923513

UPC: 7909492434993

Contact for Pricing

Overview

The WEG UMBW-4D2-40 Mini Circuit Breaker (MCB) is a compact, high-performance protective device engineered for industrial electrical systems requiring precise overcurrent and short-circuit protection. Designed as a miniature circuit breaker, this WEG product combines thermal and magnetic trip mechanisms to deliver dual-mode fault detection, safeguarding sensitive equipment and infrastructure from overloads and electrical faults. As a critical component in low-voltage distribution systems, the UMBW-4D2-40 ensures operational continuity while mitigating risks of equipment damage, downtime, and fire hazards—making it an essential safety device for modern industrial environments. WEG, a globally recognized leader in electric motor and automation technology, brings decades of expertise to the design and manufacturing of protection devices like the UMBW-4D2-40. This MCB is part of WEG’s comprehensive range of industrial circuit protection solutions, trusted by engineers and facility managers across power distribution, manufacturing, and infrastructure sectors. Its compact form factor makes it ideal for space-constrained installations, such as motor control centers, distribution panels, and branch circuit applications where reliability and precision are paramount. The UMBW-4D2-40 is engineered for a wide range of industrial applications, including: - **Motor circuits**: Protecting variable frequency drives (VFDs), pumps, fans, and compressors from overload and short-circuit conditions. - **Distribution panels**: Serving as a primary or secondary protective device in low-voltage switchgear and panelboards. - **Industrial machinery**: Safeguarding CNC machines, conveyor systems, and automated production lines. - **Commercial buildings**: Providing branch circuit protection in HVAC systems, lighting circuits, and critical infrastructure. - **Renewable energy systems**: Supporting solar and wind power distribution networks with reliable fault interruption. Selecting the right MCB involves balancing current rating, trip characteristics, and application requirements. The UMBW-4D2-40 is designed for circuits requiring a 40-ampere rating, offering a balance of performance and protection. Its thermal trip mechanism responds to sustained overloads, gradually disconnecting the circuit to prevent overheating, while the magnetic trip provides instantaneous interruption during short-circuit events—ensuring rapid fault clearance and system safety. This dual-action protection is essential in environments where electrical faults can lead to costly downtime or catastrophic equipment failure. Installation and integration are streamlined thanks to WEG’s adherence to international standards, including IEC 60898 and UL 1077, ensuring compatibility with global electrical systems. The UMBW-4D2-40 features a modular DIN-rail mounting design, allowing for quick and secure installation in control panels and distribution boards. Its robust construction, including high-quality polymer housing and corrosion-resistant terminals, ensures long-term durability even in harsh industrial conditions. Additionally, the breaker’s clear status indication (ON/OFF/TRIP) enables rapid troubleshooting and maintenance, reducing mean time to repair (MTTR) in critical applications. WEG’s reputation for innovation and reliability extends to its circuit protection portfolio. The company’s MCBs are used in mission-critical applications worldwide, from automotive manufacturing plants to offshore oil rigs. By choosing the UMBW-4D2-40, engineers and facility managers gain access to a product backed by WEG’s global service network, technical support, and commitment to quality. Whether upgrading existing systems or designing new installations, the UMBW-4D2-40 delivers the performance, safety, and peace of mind required in today’s industrial electrical environments.
  • Dual thermal and magnetic trip mechanisms for overload and short-circuit protection
  • Compact DIN-rail design for space-efficient installations in control panels
  • 40-ampere rating suitable for branch circuits and motor protection
  • Compliant with IEC 60898 and UL 1077 international standards
  • Trusted WEG quality with global service and technical support

Specifications

Package Weight (Imperial)
0.704 LB
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.
JB5-2 2 POLE JUMPER 5.2MM SPACING

1SNK905302R0000

JB5-2 2 POLE JUMPER 5.2MM SPACING
JB5-5 5 POLE JUMPER 5.2MM SPACING

1SNK905305R0000

JB5-5 5 POLE JUMPER 5.2MM SPACING
Ground Lug

DNGL

Ground Lug
ZCT,LZR-030(V),EMPR,EXP

76512124011

ZCT,LZR-030(V),EMPR,EXP
INTERLOCK UNIT,AR-12M(SEPERATE),GMC(D)-6~16M

83411621001

INTERLOCK UNIT,AR-12M(SEPERATE),GMC(D)-6~16M

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.