WEG UMBW-4D2-20 - MINI CIRCUIT BREAKER UMBW-4D2-20
WEG

UMBW-4D2-20

Alternate Item Number: 13642046

UPC: 7909492434641

Contact for Pricing

Overview

The **WEG UMBW-4D2-20 Mini Circuit Breaker** is a high-performance, compact solution designed for reliable overcurrent protection in industrial, commercial, and infrastructure applications. Part of WEG’s trusted UMBW Series, this 20A miniature circuit breaker (MCB) combines thermal and magnetic trip mechanisms to safeguard electrical circuits against overloads and short circuits. Engineered for durability and precision, the UMBW-4D2-20 ensures continuous protection while minimizing downtime and equipment damage in critical power distribution systems. **Key Features and Technical Advantages** The UMBW-4D2-20 is built to meet the demands of modern electrical installations, offering a robust combination of performance and compact design. Its **thermal-magnetic trip system** provides dual protection: the thermal element responds to sustained overloads, while the magnetic element reacts instantly to short-circuit faults. This dual-action mechanism ensures rapid disconnection of faulty circuits, preventing damage to sensitive equipment and reducing fire risks. The breaker is rated for **20A continuous current**, making it ideal for protecting branch circuits in motor control centers, distribution panels, and control panels. **Versatile Applications Across Industries** The UMBW-4D2-20 is widely used in a variety of industrial and commercial settings where reliable circuit protection is essential. Common applications include: - **Motor circuits**: Protecting electric motors from overload and short-circuit conditions in manufacturing plants, HVAC systems, and pumping stations. - **Distribution panels**: Safeguarding feeder circuits in commercial buildings, data centers, and industrial facilities. - **Control panels**: Ensuring safe operation of control circuits in automation systems, CNC machines, and robotic equipment. - **Renewable energy systems**: Providing overcurrent protection in solar and wind power installations. - **Building wiring systems**: Used in residential and commercial electrical panels to protect lighting, outlets, and appliance circuits. WEG’s UMBW Series is renowned for its **compact footprint**, allowing for high-density installations in tight spaces without compromising performance. The breaker’s **modular design** supports easy integration into DIN rail mounting systems, streamlining installation and maintenance in both new and retrofit projects. Its **high breaking capacity** ensures reliable operation even under severe fault conditions, while the **low power loss** contributes to energy efficiency in power distribution networks. **Why Choose WEG for Circuit Protection?** WEG is a globally recognized leader in electrical engineering, with decades of experience in designing and manufacturing high-quality circuit protection devices. The UMBW-4D2-20 reflects WEG’s commitment to innovation, safety, and reliability, backed by rigorous testing and compliance with international standards such as IEC 60898 and UL 1077. Professionals across industries trust WEG for its **consistent performance**, **long service life**, and **superior technical support**. **Installation and Maintenance Considerations** Proper installation of the UMBW-4D2-20 is critical to ensuring optimal performance and safety. It should be mounted on a **DIN rail** in a clean, dry environment, free from excessive vibration or contaminants. When selecting a circuit breaker, professionals must consider factors such as **rated current**, **breaking capacity**, and **application-specific requirements**. WEG provides comprehensive documentation, including wiring diagrams and technical specifications, to simplify the installation process. Regular inspection and testing of the breaker’s trip mechanisms are recommended to maintain system reliability. **Industry Trust and Compliance** The UMBW-4D2-20 is designed to meet the stringent requirements of industries such as manufacturing, oil and gas, mining, and infrastructure. Its compliance with **IEC, UL, and other international standards** ensures compatibility with global electrical systems. WEG’s global presence and extensive distribution network guarantee timely availability and support, making the UMBW-4D2-20 a preferred choice for engineers and contractors worldwide. For professionals seeking a **compact, high-performance mini circuit breaker** that delivers reliable protection and long-term durability, the **WEG UMBW-4D2-20** is an excellent investment. Whether for new installations or system upgrades, this breaker provides the safety and performance required in today’s demanding electrical environments.
  • 20A rated current for branch circuit protection
  • Thermal-magnetic trip mechanism for overload and short-circuit protection
  • Compact design for high-density DIN rail installations
  • Compliant with IEC 60898 and UL 1077 standards
  • Trusted WEG quality for industrial and commercial applications

Specifications

Connection Type
DIN Rail
Current Rating
20 A
Mounting Type
DIN Rail
Poles
2P
Series
UMBW
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.