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

UMBW-4D3-4

Alternate Item Number: 13642166

UPC: 7909492434696

Contact for Pricing

Overview

The **WEG UMBW-4D3-4 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 critical infrastructure, this miniature circuit breaker combines **thermal and magnetic trip mechanisms** to deliver dual-layer defense against overloads and fault conditions. Unlike basic fuses, the UMBW-4D3-4 resets automatically after tripping, minimizing downtime and maintenance costs in high-demand environments such as manufacturing plants, commercial buildings, and utility substations. Its space-saving design makes it ideal for panelboards, motor control centers, and distribution boards where real estate is at a premium. **Key Features and Functional Benefits:** - **Dual Trip Mechanisms:** The thermal trip responds to sustained overloads by heating a bimetallic strip, while the magnetic trip reacts instantaneously to short circuits via an electromagnetic coil. This ensures both gradual and abrupt fault conditions are addressed without compromise. - **Compact Footprint:** Measuring just a few inches in width, the UMBW-4D3-4 fits seamlessly into tight panel spaces, allowing for higher density installations without sacrificing protection. - **High Breaking Capacity:** Built to interrupt fault currents efficiently, this MCB protects downstream equipment from catastrophic damage, reducing repair costs and operational disruptions. - **Modular Design:** Compatible with industry-standard DIN rail mounting, the breaker supports quick installation and replacement, streamlining maintenance workflows for electricians and technicians. - **Compliance and Safety:** Manufactured by **WEG**, a global leader in industrial electrical solutions, the UMBW-4D3-4 meets stringent international standards (e.g., IEC 60898, UL 1077) for electrical safety and performance, ensuring peace of mind in regulated industries. **Industry Applications and Use Cases:** The WEG UMBW-4D3-4 excels in environments where electrical reliability is non-negotiable. Typical applications include: - **Motor Circuits:** Protects induction motors from overloads during startup or stalling, extending motor lifespan and preventing winding failures. - **Distribution Panels:** Safeguards branch circuits in commercial buildings, data centers, and hospitals, where uninterrupted power is critical. - **Industrial Machinery:** Shields sensitive equipment like CNC machines, conveyors, and robotic systems from transient surges or sustained overcurrents. - **Renewable Energy Systems:** Ideal for solar and wind power installations, where compact protection devices are essential for combiner boxes and inverters. - **HVAC Systems:** Ensures reliable operation of compressors, fans, and pumps by preventing thermal damage from prolonged overloads. **Why Choose WEG for Industrial Protection?** WEG is a trusted name in industrial automation and electrical engineering, with over 50 years of expertise in designing robust protection devices. The UMBW-4D3-4 reflects the company’s commitment to durability, precision, and innovation, backed by a global service network. Unlike generic alternatives, WEG MCBs undergo rigorous testing to withstand harsh industrial conditions, including vibration, temperature extremes, and electromagnetic interference. Professionals in the electrical trade rely on WEG for consistency, knowing that each breaker meets or exceeds regulatory requirements while delivering long-term reliability. **Installation and Maintenance Considerations:** Proper selection and installation are critical to maximizing the UMBW-4D3-4’s performance. Electricians should: - **Match the breaker to the load:** Select the appropriate current rating (e.g., 1A, 10A, 20A) based on the protected circuit’s nominal current, accounting for startup inrush currents in motor applications. - **Follow manufacturer guidelines:** Ensure correct wire sizing and torque specifications to prevent loose connections, which can lead to overheating or nuisance tripping. - **Integrate with coordination studies:** For complex systems, coordinate the MCB’s trip curve with upstream protective devices (e.g., fuses or larger breakers) to achieve selective coordination, minimizing unnecessary power disruptions. - **Regular inspections:** While MCBs are low-maintenance, periodic visual checks for signs of arcing, discoloration, or corrosion can prevent failures before they occur. Whether you’re upgrading an existing panel or designing a new industrial installation, the **WEG UMBW-4D3-4 Mini Circuit Breaker** offers a reliable, space-efficient solution for safeguarding your electrical infrastructure. Trusted by engineers and electricians worldwide, WEG’s MCBs deliver the performance and durability required in today’s demanding industrial landscape.
  • Dual thermal and magnetic trip mechanisms for overload and short-circuit protection
  • Compact DIN-rail mountable design for space-efficient installations
  • High breaking capacity to prevent equipment damage from fault currents
  • Compliant with IEC 60898 and UL 1077 safety standards
  • Modular and easy to install, reducing maintenance downtime

Specifications

Package Weight (Imperial)
0.99 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.