WEG UMBW-4D3-3 - MINI CIRCUIT BREAKER UMBW-4D3-3
WEG

UMBW-4D3-3

Alternate Item Number: 14363261

UPC: 7909492438212

Contact for Pricing

Overview

The WEG UMBW-4D3-3 Mini Circuit Breaker (MCB) is a compact, high-performance protective device engineered for industrial electrical systems requiring precise overcurrent and short-circuit protection. Designed to safeguard sensitive equipment and infrastructure, this miniature circuit breaker combines advanced thermal and magnetic trip mechanisms to deliver rapid response to fault conditions, preventing costly damage, electrical fires, and system downtime. As a critical component in modern power distribution networks, the UMBW-4D3-3 ensures operational continuity while maintaining the highest safety standards across diverse industrial environments. WEG, a globally recognized leader in electrical engineering and motor solutions, has developed the UMBW-4D3-3 to meet the rigorous demands of industrial applications. This MCB is part of WEG’s comprehensive line of circuit protection devices, trusted by engineers and facility managers worldwide for reliability, durability, and compliance with international safety standards. Whether installed in motor control centers, distribution panels, or branch circuits, the UMBW-4D3-3 provides consistent performance under variable load conditions, making it an ideal choice for facilities prioritizing safety and efficiency. Key applications for the WEG UMBW-4D3-3 Mini Circuit Breaker include: - **Motor circuits**: Protecting electric motors from overload and short-circuit faults in manufacturing plants, pumping stations, and HVAC systems. - **Distribution panels**: Serving as a primary or secondary protective device in low-voltage switchgear for commercial and industrial buildings. - **Industrial machinery**: Safeguarding sensitive electronic controls and automation systems from transient surges and sustained overcurrents. - **Renewable energy systems**: Providing reliable protection in solar and wind power installations where consistent power quality is essential. - **Data centers and critical infrastructure**: Ensuring uninterrupted power delivery by isolating faulty circuits without compromising system integrity. The UMBW-4D3-3 is engineered for ease of installation and maintenance, featuring a modular design that integrates seamlessly with standard DIN rail mounting systems. Its compact form factor allows for high-density installations in space-constrained environments, while the clear, tactile trip indicators enable quick diagnostics during fault events. The breaker’s robust construction, including corrosion-resistant materials and high-impact polycarbonate housing, ensures long-term reliability even in harsh industrial settings with exposure to dust, moisture, or vibration. Selecting the right circuit breaker for an industrial application requires careful consideration of several factors, including trip characteristics, interrupting rating, and coordination with upstream protective devices. The WEG UMBW-4D3-3 is designed to meet the demands of IEC 60898 and other relevant standards, offering a balance of sensitivity and robustness suitable for most industrial applications. Professionals often pair this MCB with WEG contactors and overload relays to create a complete motor protection solution, enhancing system reliability and reducing maintenance costs. WEG’s reputation for innovation and quality extends across its entire product portfolio, from industrial motors and drives to comprehensive electrical protection systems. With decades of experience serving industries such as oil and gas, mining, water treatment, and manufacturing, WEG has earned the trust of engineers and facility operators worldwide. The UMBW-4D3-3 Mini Circuit Breaker exemplifies this commitment, delivering dependable protection where it matters most—ensuring the safety of personnel, preserving equipment, and maintaining operational continuity in critical industrial systems.
  • Dual thermal and magnetic trip mechanisms for overload and short-circuit protection
  • Compact DIN rail design for high-density installations in industrial panels
  • Compliant with IEC 60898 and other international safety standards
  • Ideal for motor circuits, distribution panels, and renewable energy systems
  • Trusted WEG quality with corrosion-resistant housing for harsh environments

Specifications

Material
Polycarbonate
Mounting Type
DIN Rail
Series
UMBW-4D3
Package Weight (Imperial)
1 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.