WEG UMBW-1B1-12 - MINI CIRCUIT BREAKER UMBW-1B1-12 WEG specifications: UL approval UL1077; Trip curve B; Number of poles 1 pole; Rated current 12 A; Maximum voltage 277 VAC; Type Thermal-magnetic
WEG

UMBW-1B1-12

Alternate Item Number: 14361510

UPC: 7909492437314

Contact for Pricing

Overview

The **WEG UMBW-1B1-12 Mini Circuit Breaker** is a high-performance, compact protection device engineered for industrial and commercial electrical systems. Designed by WEG, a globally recognized leader in motor and control solutions, this circuit breaker delivers robust overcurrent protection to safeguard critical infrastructure from overloads, short circuits, and other electrical faults. Part of the UMBW series, it combines precision engineering with durable construction to ensure long-term reliability in demanding environments. Mini circuit breakers like the UMBW-1B1-12 are essential components in modern electrical distribution systems, offering fast response times and precise tripping characteristics to prevent equipment damage and downtime. Their compact footprint makes them ideal for space-constrained installations, such as control panels, machinery enclosures, and power distribution boards. Whether deployed in manufacturing plants, commercial buildings, or renewable energy systems, these devices play a pivotal role in maintaining operational safety and efficiency. Key features of the WEG UMBW-1B1-12 include: - **Compact and modular design** for easy integration into tight spaces - **High interrupting capacity** to handle fault currents effectively - **Thermal-magnetic tripping mechanism** for accurate overcurrent detection - **Durable construction** with robust materials for harsh industrial conditions - **Compliance with international standards** ensuring global compatibility and safety Industries that rely on the UMBW-1B1-12 include manufacturing, oil and gas, mining, water treatment, and renewable energy. Its versatility allows it to protect motors, transformers, lighting circuits, and sensitive electronic equipment. Professionals select WEG circuit breakers for their proven reliability, ease of installation, and compatibility with WEG’s broader automation and control ecosystem. The breaker’s DIN-rail mounting option simplifies installation, while its clear status indication aids in quick diagnostics during maintenance. WEG’s reputation for innovation and quality in electrical protection solutions makes the UMBW-1B1-12 a trusted choice for engineers and facility managers. By integrating this circuit breaker into your system, you ensure compliance with safety regulations, reduce the risk of costly electrical failures, and extend the lifespan of connected equipment. Whether upgrading existing infrastructure or designing new installations, the UMBW-1B1-12 provides a dependable layer of protection backed by WEG’s decades of expertise in industrial electrification.
  • Compact design for space-efficient installations
  • Thermal-magnetic tripping for precise overcurrent protection
  • High interrupting capacity for fault current handling
  • DIN-rail mounting for easy integration
  • Compliant with international safety standards

Specifications

Maximum voltage
277 VAC
Mounting Type
DIN-Rail
Number of poles
1 pole
Rated current
12 A
Series
UMBW
Trip curve
B
Type
Thermal-magnetic
UL approval
UL1077
Package Weight (Imperial)
0.3 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.