Mersen USWMB1 - WMB MARKER1-10
Mersen

USWMB1

Alternate Item Number: 782001443368

UPC: 782001443368

Contact for Pricing

Overview

The Mersen USWMB1 UltraSafe Bus Bar System is engineered for efficient and safe circuit distribution, designed to integrate seamlessly with Mersen UltraSafe Class CC (USCC) and Midget (USM) fuse holders. This system significantly reduces installation time compared to traditional wiring methods, offering substantial panel space savings due to its compact design. The USWMB1 provides touch-safe, shock-resistant solutions, enhancing safety for panel builders and designers. Available in 1-, 2-, and 3-phase configurations, it supports versatile applications including UL 508 panels, solar string combiner boxes, control panels, and power distribution panels. The USBB Bus Bar component is rated for 600VAC and 1000VDC, with amperage ratings of 100A for end feed and 200A for center feed. It boasts a Short Circuit Current Rating (SCCR) of 100kA when used with a Class J fuse (maximum 200A). The USBB Feeder Terminal is rated for 600VAC and 1000VDC, with a maximum amperage of 115A and an SCCR of 100kA (with a 200A Class J fuse). Key highlights include its environmentally conscious, RoHS compliant, and lead-free construction, along with a cuttable design for enhanced flexibility. The system is UL Listed to Standard 508 (File E348854) and IEC Compliant, ensuring adherence to stringent industry standards. Specific components like the USBBC1 feeder terminal accommodate wire ranges from 1/0 AWG to 10 AWG (60°C Cu) with a torque of 50 lb-in, while the USBBESB1 accommodates 14 AWG to 1 AWG (75°C Cu) with 35 lb-in torque. Bus bar options include 25mm² cross-section with 17.8mm pitch in copper material for 1, 2, and 3-phase configurations. Protective covers (USBBPC) and end caps (USBB1PHEC, USBB23PHEC) are also available to complete the installation. The Mersen USWMB1 is a reliable and space-saving solution for modern industrial electrical systems.
  • Designed for Mersen UltraSafe Class CC (USCC) and Midget (USM) fuse holders
  • Reduces installation time and saves panel space
  • Touch-safe and shock-resistant design
  • Rated for 600VAC / 1000VDC with SCCR up to 100kA
  • UL Listed to Standard 508 and IEC Compliant

Specifications

Application
Used with Ultrasafe Fuse Holders
Brand Name
Ferraz Shawmut
Class
Accessory
Sub Brand
UltraSafe
Type
UltraSafe Accessory
Ferraz Shawmut Nylon Fuse Pullers are fully insulated, made of high-dielectric, high impact nylon with no-slip handles and protective finger stops for greater safety when inserting fuses. Yellow color for safety. 600 Volts 600 Amps large size series.

34-003G

Ferraz Shawmut Nylon Fuse Pullers are fully insulated, made of high-dielectric, high impact nylon with no-slip handles and protective finger stops for greater safety when inserting fuses. Yellow color for safety. 600 Volts 600 Amps large size series.
Cover DFC Series 250VAC 100A Class R, K, H LED

DFC-4I

Cover DFC Series 250VAC 100A Class R, K, H LED
Cover DFC Series 600VAC 30A Class J LED

DFC-1I

Cover DFC Series 600VAC 30A Class J LED
Cover DFC Series 600VAC 100A Class SJ

DFC-11

Cover DFC Series 600VAC 100A Class SJ
Cover DFC Series 600VAC 200A Class J

DFC-12

Cover DFC Series 600VAC 200A Class J
Neutral link used to replace Class H fuses . 250V 30A

NL30

Neutral link used to replace Class H fuses . 250V 30A
Neutral link used to replace Class J fuses . 600V 60A

NLJ60

Neutral link used to replace Class J fuses . 600V 60A
Mersen UltraSafe Fuse Modules (USFM) have a unique, compact design suited for use with 45mm wide IEC contactors. These modules also offer other features not found on other class CC and midget UltraSafe fuseholders such as an auxiliary contact option. When the auxiliary is wired to an adjacent contactor the load is dropped out by the contactor immediately once the fuse extractor handle is opened. Additionally, the fuse module features padlock capabilities, compact bus bars for line side terminations, and tool free removal from DIN rail. Yet the fuse modules still incorporate well known UltraSafe features such as IP20 protection, easy operating fuse extraction handles and an open fuse visual indication option. Adaptor marking strip

USCMA

Mersen UltraSafe Fuse Modules (USFM) have a unique, compact design suited for use with 45mm wide IEC contactors. These modules also offer other features not found on other class CC and midget UltraSafe fuseholders such as an auxiliary contact option. When the auxiliary is wired to an adjacent contactor the load is dropped out by the contactor immediately once the fuse extractor handle is opened. Additionally, the fuse module features padlock capabilities, compact bus bars for line side terminations, and tool free removal from DIN rail. Yet the fuse modules still incorporate well known UltraSafe features such as IP20 protection, easy operating fuse extraction handles and an open fuse visual indication option. Adaptor marking strip
CCD right side - for MTA Baltimore

EP448

CCD right side - for MTA Baltimore
Cover DFC Series 600VAC 30A Class SJ

DFC-10

Cover DFC Series 600VAC 30A Class SJ
Fuse Reducer 600V Class R 200 - 400

R422

Fuse Reducer 600V Class R 200 - 400
Cover DFC Series 600VAC 60A Class R, K, H LED

DFC-5I

Cover DFC Series 600VAC 60A Class R, K, H LED

Frequently Asked Questions about Mersen

What industries and applications are Mersen products used for?

Mersen products are used across diverse industrial sectors including solar power, electric vehicles, buildings/construction, industrial automation, power distribution, HVAC, elevators, telecommunications, and specialty manufacturing. Key application areas include circuit protection, surge protection, battery module protection, electrical safety systems, and power management for residential, commercial, and utility-scale installations.

What are the main product lines offered by Mersen?

Mersen offers five primary electrical power product lines: IEC and UL/CSA Fuses and Fusegear, Surge Protection, Low Voltage Disconnect Switches, Power Distribution Blocks, and Engineered Solutions. Their comprehensive range includes specialized components like high-speed fuses, modular fuse holders, surge arresters, and custom-engineered electrical protection systems for industrial and power management applications.

What are the key features of Mersen products?

Mersen products feature advanced electrical protection and power management solutions with key characteristics including finger-safe design, compact modularity, and high-performance safety features. Their product lines span electrical power components like fuses, surge protection, power distribution blocks, and specialized solutions for industrial, solar, and building applications. Critical features include UL/CSA approvals, high short-circuit current ratings, and innovative technologies like the Fuse Control™ program that minimize electrical risks and optimize system performance.

What environmental ratings do Mersen products have?

Mersen products meet rigorous environmental ratings across multiple standards, including UL 508A Type 1, 2, 3, 4, 4X, 12, and 13, CSA Type 1, 2, 3, 4, 4X, 12, and 13, and NEMA Type 1, 2, 3, 4, 4X, 12, and 13. They feature IEC 60529 IP66 protection, with enhanced UV inhibitors for outdoor weathering and operating temperatures ranging from -40°C to 130°C (-40°F to 266°F). These ratings ensure superior protection in wet, corrosive, and challenging industrial environments.

What accessories are available for Mersen products?

Mersen offers multiple accessories for their fuse blocks and systems, including safety pullers (DFC3M and DFC3LP), DIN-rail adapters (DRM), bus bars, auxiliary contacts, and specialized mounting hardware. Key accessories include the DFC3M safety puller for 1-1/2" x 13/32" midget or Class CC fuses, the DRM adapter for mounting 303 series fuse blocks on DIN-rail, and UltraSafe fuse module accessories like bus bars and auxiliary contacts that enable module interconnection and monitoring.

How are Mersen products typically installed?

Mersen products are typically installed in electrical distribution systems, control panels, and industrial automation environments using multiple mounting options. These include service entrance panel mounting, distribution panel installation, control panel DIN rail mounting, and custom engineered solutions like Fused Coordination Panelboards. Installation depends on the specific product type, such as fuses, surge protective devices, or switches, and is designed to provide electrical protection and circuit safety in various industrial and commercial applications.

What certifications and standards do Mersen products comply with?

Mersen products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Our products meet rigorous safety and performance standards for industrial applications across North America, China, Russia, and other global markets, ensuring compliance and reliability in electrical power and advanced materials solutions.

What technical support does Mersen offer?

Mersen provides comprehensive technical support through multiple channels, including technical experts located in your time zone who can assist with product selection, application guidance, and troubleshooting. Their Fuse Control™ program offers a free Fuse Inventory Audit & Analysis, and customers can access technical resources through their sales representatives and online platform ep.mersen.com.