WEG Strategic Partner Distributor
WEG UMBW-4D3-35 - MINI CIRCUIT BREAKER UMBW-4D3-35

WEG UMBW-4D3-35 MINI CIRCUIT BREAKER UMBW-4D3-35

Alternate Item Number: 14363304

UPC: 7909492438229

Contact for Pricing

Call +1 (262) 252-1600 (toll-free 877-268-3700) or email [email protected] for pricing and availability.

Overview

The WEG UMBW-4D3-35 Mini Circuit Breaker is a high-performance miniature circuit breaker (MCB) engineered for robust overcurrent protection in industrial electrical systems. Designed by WEG, a globally recognized leader in electrical motor and automation solutions, this MCB combines thermal and magnetic trip mechanisms to safeguard branch circuits against overloads and short circuits. Its compact form factor makes it ideal for space-constrained installations in motor control centers, distribution panels, and industrial power distribution systems where reliable circuit protection is critical. Miniature circuit breakers like the UMBW-4D3-35 are essential components in modern electrical protection strategies. They automatically disconnect power during fault conditions, preventing equipment damage, electrical fires, and costly downtime. The thermal trip mechanism responds to sustained overcurrent conditions by gradually heating a bimetallic strip, which eventually trips the breaker to interrupt the circuit. Meanwhile, the magnetic trip provides instantaneous protection against short circuits by detecting sudden current surges. This dual-mechanism approach ensures comprehensive protection for both gradual overloads and abrupt fault events. The UMBW-4D3-35 is particularly well-suited for industrial applications where electrical systems operate under demanding conditions. It is commonly deployed in: - Motor circuits: Protecting industrial motors from overload conditions that could lead to overheating and failure. - Distribution panels: Safeguarding branch circuits in manufacturing plants, processing facilities, and commercial buildings. - Control panels: Ensuring reliable operation of automation and control systems by preventing electrical faults from cascading. - Renewable energy systems: Providing overcurrent protection in solar and wind power installations where stable electrical distribution is critical. WEG’s reputation for engineering excellence and reliability extends across its entire product portfolio, and the UMBW-4D3-35 Mini Circuit Breaker is no exception. With decades of experience in electrical protection and industrial automation, WEG delivers products that meet stringent international standards, including IEC and UL certifications. Professionals in the electrical engineering and maintenance fields trust WEG for its consistent performance, durability, and compatibility with a wide range of industrial systems. Installation and maintenance of the UMBW-4D3-35 are straightforward, thanks to its modular design and standardized mounting options. It can be easily integrated into DIN rail systems, which are prevalent in industrial control panels and distribution boards. The breaker’s compact size allows for high-density installations, maximizing panel space efficiency without compromising protection. Regular maintenance typically involves visual inspections for signs of wear or damage, and testing trip mechanisms to ensure proper operation. For engineers and procurement professionals selecting circuit protection solutions, the WEG UMBW-4D3-35 offers a balance of performance, reliability, and value. Its proven track record in industrial environments, combined with WEG’s global support network, makes it a dependable choice for protecting critical electrical infrastructure. Whether upgrading existing systems or designing new installations, the UMBW-4D3-35 provides the essential protection needed to maintain operational continuity and safety in industrial power systems.
  • Dual thermal and magnetic trip mechanisms for comprehensive protection
  • Compact design ideal for space-constrained industrial installations
  • Compatible with DIN rail mounting systems for easy integration
  • Protects motor circuits, distribution panels, and control systems
  • Manufactured by WEG, a trusted leader in industrial electrical solutions

Specifications

Current Rating
35 A
Poles
4
Series
UMBW
Package Weight (Imperial)
1 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.