WEG UMBW-1B2-50 - MINI CIRCUIT BREAKER UMBW-1B2-50 WEG specifications: UL approval UL1077; Trip curve B; Number of poles 2 poles; Rated current 50 A; Maximum voltage 277/480 VAC; Type Thermal-magnetic
WEG

UMBW-1B2-50

Alternate Item Number: 14353109

UPC: 7909492435297

Contact for Pricing

Overview

The **WEG UMBW-1B2-50 Mini Circuit Breaker** is a high-performance electrical protection device engineered for industrial applications where reliability and safety are paramount. Designed by **WEG**, a globally recognized leader in electrical solutions, this mini circuit breaker delivers robust protection against overloads and short circuits, ensuring the integrity of critical electrical systems. The UMBW series exemplifies WEG’s commitment to innovation, durability, and compliance with stringent industry standards, making it a trusted choice for professionals in manufacturing, automation, energy, and infrastructure sectors. **Key Features and Technical Advantages** The WEG UMBW-1B2-50 is built for demanding environments, offering a **compact design** that simplifies installation in tight spaces while maintaining high operational efficiency. Its precision-engineered mechanism ensures rapid response to fault conditions, minimizing downtime and reducing the risk of equipment damage. The breaker is designed to integrate seamlessly with industrial control panels, switchgear, and distribution boards, providing a reliable barrier against electrical faults. **Industry Applications and Use Cases** This mini circuit breaker is ideal for a wide range of industrial applications, including: - **Manufacturing plants** – Protecting machinery and control circuits from electrical faults. - **Automation systems** – Safeguarding sensitive electronic components in PLC and HMI systems. - **Renewable energy installations** – Ensuring safe operation of solar inverters, wind turbines, and battery storage systems. - **Commercial buildings** – Providing localized protection for lighting, HVAC, and auxiliary power systems. - **Oil and gas facilities** – Meeting stringent safety requirements in hazardous environments. **Why Choose WEG for Industrial Protection?** WEG has established itself as a trusted name in electrical engineering, with decades of experience in designing solutions that meet the rigorous demands of industrial applications. The UMBW series, including the **UMBW-1B2-50**, reflects this expertise through: - **Compliance with international standards** such as IEC 60898, UL 1077, and EN 60947-2, ensuring global applicability. - **High interrupting capacity** to handle fault currents effectively without compromising performance. - **Modular and scalable design** for easy integration into existing electrical systems. - **Long service life** with minimal maintenance requirements, reducing total cost of ownership. **Installation and Maintenance Considerations** Professionals in electrical engineering and maintenance prioritize circuit breakers that offer both **ease of installation** and **long-term reliability**. The WEG UMBW-1B2-50 excels in both areas: - **Quick-mounting design** compatible with DIN rail systems, allowing for fast deployment in new or retrofit projects. - **Clear status indication** (ON/OFF/TRIP) for immediate fault diagnosis and troubleshooting. - **Low heat generation** due to optimized thermal management, enhancing system efficiency. - **Resistance to environmental factors** such as vibration, dust, and temperature fluctuations, ensuring consistent performance in harsh conditions. **Selecting the Right Circuit Breaker for Your Application** When choosing a mini circuit breaker for industrial use, several factors come into play: - **Current rating** – Matching the breaker’s rating to the load requirements of the circuit. - **Interrupting capacity** – Ensuring the breaker can safely interrupt fault currents without damage. - **Trip characteristics** – Selecting the appropriate curve (B, C, or D) based on the type of load (resistive, inductive, or highly inductive). - **Compliance and certifications** – Verifying adherence to local and international safety standards. The **WEG UMBW-1B2-50** addresses all these considerations, providing a **cost-effective, high-performance solution** for professionals who demand reliability without compromise. Whether deployed in a factory automation system, a renewable energy project, or a critical infrastructure facility, this mini circuit breaker delivers the protection and peace of mind that modern industrial operations require. **Conclusion** In an era where electrical systems are becoming increasingly complex and sensitive, the need for **high-quality protection devices** has never been greater. The **WEG UMBW-1B2-50 Mini Circuit Breaker** stands out as a premier choice for engineers and facility managers seeking a **durable, efficient, and standards-compliant** solution. Backed by WEG’s reputation for engineering excellence, this breaker ensures that your electrical infrastructure remains **safe, reliable, and future-ready**—today and for years to come.
  • High-performance protection against overloads and short circuits
  • Compact design for easy installation in tight spaces
  • Compliant with IEC 60898, UL 1077, and EN 60947-2 standards
  • Ideal for manufacturing, automation, and renewable energy systems
  • Low maintenance, long service life with WEG reliability

Specifications

Current Rating
50 A
Maximum voltage
277/480 VAC
Mounting Type
DIN Rail
Number of poles
2 poles
Rated current
50 A
Series
UMBW
Trip curve
B
Type
Thermal-magnetic
UL approval
UL1077
Package Weight (Imperial)
0.7 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.