WEG UMBW-4D2-50 - MINI CIRCUIT BREAKER UMBW-4D2-50
WEG

UMBW-4D2-50

Alternate Item Number: 14363201

UPC: 7909492438137

Contact for Pricing

Overview

The WEG UMBW-4D2-50 Mini Circuit Breaker is a high-performance, compact electrical protection device designed for industrial applications requiring reliable overcurrent and short-circuit protection. Part of WEG's renowned UMBW series, this 4-pole (4P) circuit breaker delivers a rated current of 50 amperes, making it ideal for protecting branch circuits, motor circuits, distribution panels, and industrial power systems. Engineered with both thermal and magnetic trip mechanisms, the UMBW-4D2-50 ensures comprehensive defense against overload conditions and fault currents, preventing equipment damage, electrical fires, and costly downtime. Industrial facilities across manufacturing, mining, oil & gas, and infrastructure sectors rely on WEG's UMBW series for its proven durability and precision. The UMBW-4D2-50 is particularly suited for environments where space is at a premium but performance cannot be compromised. Its compact design allows for easy integration into control panels, switchgear, and motor control centers (MCCs), while maintaining compliance with international safety standards. Professionals choose WEG circuit breakers for their consistent operation, long service life, and compatibility with a wide range of industrial electrical systems. Key features of the UMBW-4D2-50 include: - **4-pole configuration** for balanced protection in three-phase systems with neutral or ground monitoring - **50A current rating** for branch circuits and motor protection applications - **Dual trip mechanisms** (thermal for overload, magnetic for short circuits) for comprehensive fault response - **Modular design** compatible with standard DIN rail mounting systems - **High breaking capacity** to safely interrupt fault currents and protect downstream equipment WEG, a global leader in industrial electric motors and automation solutions, brings decades of expertise to its circuit protection portfolio. The UMBW series reflects the company's commitment to innovation, reliability, and safety in electrical distribution systems. Whether deployed in new installations or as part of retrofit projects, the UMBW-4D2-50 ensures dependable operation under demanding industrial conditions. Installation is straightforward, with clear labeling and standardized terminals for quick integration into existing systems. Maintenance is minimal, thanks to the breaker's robust construction and WEG's reputation for quality. Selecting the right circuit breaker involves evaluating current ratings, pole configuration, and application-specific requirements. The UMBW-4D2-50's 50A rating and 4-pole design make it a versatile choice for protecting motors, transformers, and distribution feeders in industrial settings. Engineers and electricians trust WEG for products that meet or exceed industry standards, including IEC 60947-2 and UL 489 certifications. With a focus on safety, efficiency, and longevity, the UMBW-4D2-50 is an essential component for any industrial electrical protection strategy.
  • 50A rated current for branch circuit and motor protection
  • 4-pole configuration for balanced three-phase systems with neutral/ground monitoring
  • Dual thermal and magnetic trip mechanisms for overload and short-circuit protection
  • Compact design compatible with DIN rail mounting systems
  • High breaking capacity for safe fault current interruption

Specifications

Current Rating
50 A
Mounting Type
DIN Rail
Poles
4P
Series
UMBW
Package Weight (Imperial)
0.7 LB
Ground Lug

DNGL

Ground Lug
COVER,SET,AP-400,MC-265a~400a

64611614007

COVER,SET,AP-400,MC-265a~400a
INTERLOCK UNIT,AR-12M(SEPERATE),GMC(D)-6~16M

83411621001

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

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.