Mersen USFMBB2 - USFM - BB 600V 3-Pole B2 phases
Mersen

USFMBB2

Alternate Item Number: USFMBB2

UPC: 782001382124

Contact for Pricing

Overview

The Mersen UltraSafe Fuse Module (USFMBB2) is a high-performance, compact fuse protection solution engineered for 45mm IEC contactors operating at 600V and 63A. Designed to meet the rigorous demands of industrial electrical systems, this 3-pole fuse module delivers unparalleled safety, reliability, and ease of installation in a space-efficient package. Part of Mersen’s renowned UltraSafe series, the USFMBB2 is optimized for applications requiring precise overcurrent protection without compromising on operational efficiency or compliance with international standards. This fuse module stands out with its unique auxiliary contact option, a feature rarely found in Class CC or midget fuse holders. When integrated with adjacent IEC contactors, the auxiliary contact ensures immediate load dropout upon attempted removal of the fuse extractor handle—enhancing safety by preventing accidental exposure to live circuits during maintenance. Additionally, the USFMBB2 includes padlock capabilities, allowing for secure locking of the fuse module in place, which is critical in high-risk environments where unauthorized access must be prevented. The compact design of the USFMBB2 is specifically tailored for 45mm IEC contactors, making it an ideal choice for panel builders and system integrators working within tight space constraints. Its DIN rail mounting system ensures quick and tool-free installation or removal, streamlining both initial setup and future maintenance. The module also features IP20-rated protection, safeguarding against accidental contact with live parts while maintaining accessibility for routine inspections. Mersen’s UltraSafe series is trusted across industries such as manufacturing, energy, transportation, and infrastructure, where electrical safety and system reliability are non-negotiable. The USFMBB2’s open fuse visual indication option provides immediate visual confirmation of fuse status, reducing troubleshooting time and minimizing downtime. The inclusion of compact busbars for line-side terminations further simplifies wiring, reducing installation errors and improving overall system integrity. Professionals selecting the USFMBB2 benefit from Mersen’s decades of expertise in electrical protection solutions. Whether deployed in motor control centers, power distribution panels, or renewable energy systems, this fuse module delivers consistent performance under demanding conditions. Its compliance with industry standards and compatibility with a wide range of IEC contactors make it a versatile addition to any electrical protection strategy. For engineers, electricians, and facility managers seeking a reliable, high-quality fuse module, the Mersen UltraSafe Fuse Module (USFMBB2) represents a smart investment in safety, efficiency, and long-term operational excellence.
  • 600V voltage rating with 63A current capacity for robust overcurrent protection
  • Compact 3-pole design optimized for 45mm IEC contactors
  • Auxiliary contact option enables immediate load dropout for enhanced safety
  • Padlock capabilities for secure locking during maintenance
  • IP20-rated protection with tool-free DIN rail mounting
  • Open fuse visual indication for quick status verification
  • Compact busbars for simplified line-side terminations
  • Part of Mersen’s trusted UltraSafe series for industrial reliability

Specifications

AC Voltage Rating
600 V
Amperage Rating
30 A
Amperage Rating
63 A
Application
Primarily for motor circuits to replace circuit breakers for higher SCCR ratings Other circuits up to 600 volts for control circuits, transformers, etc. Non-load disconnect Padlock compliance RECOMMENDED FUSE USAGE: USM use with: ATQ, ATM(1), A6Y-2B, A25Z-2, TRM, OTM, A13X-2, A60Q-2, DCT(1) USCC use with: ATDR, ATMR(1), ATQR (1) Recommended for DC applications
Application
Primarily for replacement of circuit breakers in motor circuits to achieve higher SCCR Circuits up to 600V for motors, control, transformers, etc… Applications requiring lock-out / tag-out procedures
Brand Name
Ferraz Shawmut
Class
Accessory
DC Voltage Rating
600 V
Short Circuit Rating
200 kA
Size
2.87 x 0.51 x 0.8 in
Special Features
Dedicated 3-pole fuse module Compact footprint - 45mm width IP20 Finger-safe Auxiliary contact option (1NO/1NC) Ability to padlock in Open position with 1/4" diameter shank DIN-rail mount with tool free removal Optional visual blown fuse indication
Special Features
Dedicated 3-pole fuse module Finger-safe Compact footprint with 45mm width Auxiliary contact option (1NO/1NC) Ability to padlock in OPEN position with 1/4" shank diameter DIN-rail mount with tool free removal Quick, easy fuse change Optional indicator lights
Standard
UL Listed to standard 4248-4, File E52283 CSA Certified C22.2, Class 6225, File 32169 UL Listed to standard 508, File E336456 UL Recognized Component to standard 4248-1, File E319605 UL Recognized Component to standard 4248-14, File E52283 CSA Certified C22.2, Class 6225, File 32169 IEC Compliant to 60269-2-1, 60947-3
Standard
USFMCC (Class CC Fuses) UL Listed, guide IZLT, File E52283 CSA Certified C22.2, class 6225 01, File 32169 USFM10 (Midget 10x38mm Fuses) UL Recognized Component, guide IZLT2, File E52283 CSA Certified C22.2, Class 6225 01, File 32169 IEC Certified 60269-1, 60947-3 (690VAC, 32A, 120kA)
Type
UltraSafe
Type
Busbar
Voltage Rating
600 VAC
Package Dimensions (L x W x H)
3.39 IN x 1.26 IN x 0.52 IN
Package Dimensions (L x W x H)
8.6106 cm x 3.2004 cm x 13.208 mm
Package Weight (Imperial)
0.450 L
Package Weight (Metric)
0.204 kg
USFM - BB 600V 3-Pole C1 phases

USFMBBC1

USFM - BB 600V 3-Pole C1 phases

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.