Mersen FSB1 - Mersen's complete line of single and dual pole in-line fuseholders accommodate Class CC fuses. The fuseholders are designed for quick installation. Securing nuts or screws are captive thus speeding installation by reducing the need to locate and assemble loose components in the field. Three internal O-rings per pole seal the fuseholder providing a water-resistant compartment for the fuse. The captive O-rings are colored (blue for single pole and red for dual pole) for quick detection. Optional cone shaped insulator boots can be slipped on to provide a watertight seal (breakaway versions come with boots standard). Both single and dual pole versions have an optional breakaway feature which safely disconnects the load in case of a pole knockdown. Fuses remain safely encapsulated within the watertight fuse holder on the load side. Once the pole has been reinstalled the fuseholder can be easily reconnected. single terminal boot
Mersen

FSB1

Alternate Item Number: 782001301415

UPC: 782001301415

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Overview

Mersen FSB1 single and dual pole in-line fuseholders (SKU: FSB1) are engineered for Class CC fuses (1-1/2" x 13/32", 10 x 38 mm) in 600VAC/DC applications up to 30A. Designed for rapid field installation, these fuseholders feature captive securing nuts or screws to eliminate loose components and reduce assembly time. Each pole includes three internal O-rings (blue for single pole, red for dual pole) that create a water-resistant compartment around the fuse, ensuring reliable operation in humid or corrosive environments such as street lighting, parking lot lighting, traffic signaling, sports lighting, boats, and marinas. Optional cone-shaped insulator boots provide a watertight seal, with breakaway versions including these boots as standard. The breakaway feature safely disconnects the load during pole knockdown, keeping fuses encapsulated within the watertight holder for protection. Once the pole is reinstalled, the fuseholder can be easily reconnected without tool intervention. Available in both single and dual pole configurations with screw terminal connections, the FSB1 fuseholders are UL Listed (Class CC Guide IZLT, File E52283), UL Recognized Component (Midget Guide IZLT2), and CSA Certified (Class CC and Midget, Class 6225, File 32169). The fuseholders accept recommended fuses including ATDR, ATMR, ATQR (Class CC) and ATQ, ATM, TRM, OTM, GGU, GFN, A13X-2, A25Z-2, A60Q-2, A6Y-2B (Midget). With a temperature rating of 155°C and short-circuit current rating (SCCR) of 200kA for Class CC fuses and 100kA for Midget fuses, the FSB1 delivers robust performance in demanding industrial and commercial applications.
  • Accommodates Class CC (1-1/2" x 13/32") and Midget (10 x 38 mm) fuses
  • Captive securing nuts/screws for rapid field installation
  • Three internal O-rings per pole (blue/red) for water-resistant sealing
  • Optional cone-shaped insulator boots for watertight protection
  • Breakaway feature safely disconnects load during pole knockdown

Specifications

Application
Street lighting Parking lot lighting Traffic signaling Sports lighting Boats and marinas Humid/corrosive environments
Brand Name
Ferraz Shawmut
Color
Blue/Red
Connection Type
Screw Terminal
Ip Rating
IP66/IP67
Material
Poly
Mounting
In-Line
Mounting Type
Inline
Poles
1P/2P
Series
FSB
Special Features
Breakaway version quickly disconnects line side during pole knockdown in compliance with state and federal highway commission standards 3 O-rings per pole for watertight applications Colored O-rings for quick detection Single and dual poles Accepts midget or class CC fuses Wide assortment of terminal variations High heat, impact resistant insulator Captive nut or screw for quick installations Polarized dual pole provides simultaneous disconnection Permanently installed neutral versions quickly identified by white nuts Environmentally friendly no-lead solder used Highly visible catalog number even with insulation boots installed Wire gauge size identified on insulation boots for quick, accurate trimming
Type
In-line Fuse Holders
Voltage Rating
600 VAC
Package Dimensions (L x W x H)
3.434 IN x 0.87 IN x 0.87 IN
Package Dimensions (L x W x H)
8.7224 cm x 22.098 mm x 22.098 mm
Package Weight (Imperial)
0.050 L
Package Weight (Metric)
0.023 kg
The Littelfuse 600 V in-line watertight fuse holders are the ideal answer for all high humidity and corrosive environments where fuses are required. Available in both breakaway and non-breakaway, single and double pole versions, these fuse holders allow maximum flexibility for any application.

LEBBAS

The Littelfuse 600 V in-line watertight fuse holders are the ideal answer for all high humidity and corrosive environments where fuses are required. Available in both breakaway and non-breakaway, single and double pole versions, these fuse holders allow maximum flexibility for any application.
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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.