Mersen USCM0 - 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. Blank marking strip
Mersen

USCM0

Alternate Item Number: 782001443337

UPC: 782001443337

Contact for Pricing

Overview

The Mersen UltraSafe Fuse Modules (USFM) are compact 3-pole fuse modules designed for seamless integration with 45mm wide IEC contactors, offering a reliable and safe solution for industrial motor circuits and control applications. These modules are engineered to replace circuit breakers in motor circuits, providing higher Short Circuit Current Ratings (SCCR) up to 200kA for Class CC fuses and 100kA for midget 10x38mm fuses. The USFM series includes models for both Class CC (USFMCC) and midget fuses (USFM10), with optional indicator lights and auxiliary contacts (1NO/1NC) for immediate load disconnection when the fuse extractor handle is opened. Key features include padlock capabilities for secure access control, compact bus bars for line-side terminations, and tool-free removal from DIN rail for simplified maintenance. The modules are finger-safe with IP20 protection, feature easy-operating fuse extraction handles, and offer open fuse visual indication options. With UL Listed, CSA Certified, and IEC Certified ratings, the USFM series ensures compliance with global safety standards. Ideal for motor circuits, control panels, transformers, and other industrial applications up to 600V AC/DC, these modules provide a dependable and efficient solution for panel builders and system integrators.
  • Compact 45mm width for 45mm IEC contactor integration
  • Auxiliary contact option (1NO/1NC) for immediate load disconnection
  • Padlock capabilities for secure access control in OPEN position
  • Tool-free removal from DIN rail for easy maintenance
  • IP20 finger-safe protection with open fuse visual indication
  • Supports Class CC and midget 10x38mm fuses up to 30A
  • SCCR ratings up to 200kA (Class CC) and 100kA (midget)
  • Compact bus bars for line-side terminations
  • UL Listed, CSA Certified, and IEC Certified
  • Optional indicator lights for blown fuse detection

Specifications

Application
Used with Ultrasafe Fuse Holders
Brand Name
Ferraz Shawmut
Class
Accessory
Sub Brand
UltraSafe
Type
UltraSafe Accessory
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
USFM - BB 600V 3-Pole C1 phases

USFMBBC1

USFM - BB 600V 3-Pole C1 phases
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. 1-10 marking strip

USCM1

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. 1-10 marking strip
USFM - Aux Contact EarlBreak/Late Make

USFMAC11

USFM - Aux Contact EarlBreak/Late Make
USFM - BB 600V 3-Pole B3 phases

USFMBB3

USFM - BB 600V 3-Pole B3 phases
USFM - BB 600V 3-Pole B4 phases

USFMBB4

USFM - BB 600V 3-Pole B4 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.