WEG UMBW-4B1-50 - MINI CIRCUIT BREAKER UMBW-4B1-50
WEG

UMBW-4B1-50

Alternate Item Number: 14360409

UPC: 7909492436140

Contact for Pricing

Overview

The **WEG UMBW-4B1-50 Mini Circuit Breaker** is a high-performance, compact solution engineered for superior electrical protection in industrial and commercial environments. Designed to safeguard sensitive equipment and critical infrastructure, this mini circuit breaker delivers precise overload and short-circuit protection, ensuring operational continuity and reducing unplanned downtime. Built by **WEG**, a global leader in industrial automation and electrical solutions, the UMBW-4B1-50 combines robust construction with advanced thermal-magnetic trip technology to provide reliable performance under demanding conditions. Mini circuit breakers like the UMBW-4B1-50 are essential components in modern electrical distribution systems, offering fast response times to fault conditions while maintaining system integrity. The thermal-magnetic trip mechanism integrates both overload and short-circuit protection into a single, compact unit, making it ideal for applications where space is limited but reliability cannot be compromised. WEG’s reputation for engineering excellence ensures that this breaker meets stringent international safety standards, including IEC and UL certifications, providing peace of mind for engineers and facility managers. **Key Applications and Industry Use Cases:** The WEG UMBW-4B1-50 Mini Circuit Breaker is widely used across a range of industrial sectors, including manufacturing plants, commercial buildings, renewable energy systems, and infrastructure projects. Typical applications include: - **Control panels and switchgear** – Protecting branch circuits and downstream equipment from overcurrent events. - **Machinery and automation systems** – Safeguarding motors, drives, and control circuits in CNC machines, robotics, and conveyor systems. - **Power distribution networks** – Serving as a main or branch breaker in low-voltage electrical panels. - **Renewable energy installations** – Providing protection in solar inverters, wind turbine control systems, and battery storage units. - **Building management systems** – Ensuring safety in HVAC, lighting, and security systems within commercial facilities. **Why Choose the WEG UMBW-4B1-50?** Professionals in industrial electrical design and maintenance prioritize circuit breakers that combine reliability, ease of installation, and compatibility with existing systems. The UMBW-4B1-50 excels in all these areas: - **Compact and modular design** – Fits seamlessly into standard DIN rail mounting systems, allowing for efficient panel layout and scalability. - **High interrupting rating** – Capable of safely interrupting fault currents, protecting both equipment and personnel. - **Easy installation and maintenance** – Features quick-connect terminals and standardized mounting, reducing commissioning time and labor costs. - **Wide compatibility** – Designed to integrate with WEG’s ecosystem of motor control and protection devices, as well as third-party systems. - **Long service life** – Constructed with high-quality materials to withstand harsh industrial environments, including vibration, dust, and temperature extremes. **Selection and Installation Best Practices:** When specifying the WEG UMBW-4B1-50, engineers should consider the system’s nominal current, fault current rating, and environmental conditions. Proper sizing ensures optimal protection without nuisance tripping, while adherence to local electrical codes (e.g., NEC, IEC 60947) guarantees compliance and safety. Installation should be performed by qualified personnel, with attention to proper torque on connections and adequate clearance for heat dissipation. Regular inspection and testing, such as thermal imaging and insulation resistance checks, help maintain peak performance over the breaker’s lifecycle. **WEG: A Trusted Partner for Industrial Protection** With decades of experience in electrical engineering and automation, WEG has established itself as a trusted name in industrial protection solutions. The company’s commitment to innovation, quality, and sustainability is reflected in products like the UMBW-4B1-50, which are designed to enhance system reliability and reduce total cost of ownership. By choosing WEG, businesses gain access to a global support network, technical expertise, and a product line that scales from small installations to large industrial complexes. For facilities where electrical safety and uptime are non-negotiable, the WEG UMBW-4B1-50 Mini Circuit Breaker delivers uncompromising protection and performance.
  • Compact and modular design for DIN rail mounting
  • Advanced thermal-magnetic trip mechanism for overload and short-circuit protection
  • High interrupting rating for enhanced safety
  • Easy installation with quick-connect terminals
  • Compatible with WEG and third-party electrical systems

Specifications

Connection Type
Screw Terminal
Mounting Type
DIN Rail
Series
UMBW
Package Weight (Imperial)
0.3 LB
Ground Lug

DNGL

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

83411621001

INTERLOCK UNIT,AR-12M(SEPERATE),GMC(D)-6~16M
ZCT,LZR-030(V),EMPR,EXP

76512124011

ZCT,LZR-030(V),EMPR,EXP
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.