Mersen SFRB4 - Bayonet Knob In-Line Fuseholders for FSFE fuses. Used at 32V or less with fuses rated up to 20A when proper spring for fuse size is installed. 32 Volts 4 Amps SFRB series.
Mersen

SFRB4

Alternate Item Number: 782001244392

UPC: 782001244392

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Minimum Qty: 10

Multiplier: 10

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Overview

The Mersen SFRB4 Bayonet Knob In-Line Fuseholder (SKU: SFRB4) provides reliable overcurrent protection for low-voltage DC applications. Designed for FSFE fuses, this in-line holder features a secure bayonet knob for easy and safe fuse access. It is rated for 32 volts and a maximum of 4 amperes, with the capability to handle up to 20A when the appropriate spring for the fuse size is installed, accommodating FSFE fuses from 4A to 20A. The SFRB series is specifically engineered for use at 32V or less. Key features include nickel-plated phosphor-bronze fuse clips for optimal conductivity and durability. The holder is designed for mounting with 3/16" (4.8mm) screws on centers spaced 2.25" (57.2mm) apart. This fuseholder is UL Listed, ensuring compliance with safety standards. Ideal for power distribution units, motor controllers, battery management systems, and test equipment where space is a consideration and dependable protection is paramount. Mersen's commitment to quality and electrical safety is evident in the robust construction and precise engineering of the SFRB4, making it a trusted component for industrial and electronic systems. The SFRB4 is specifically designed for FSFE fuses. The fuseholder is rated for 32 Volts. The SFRB4 is part of the SFRB series. The fuseholder can be used at 32V or less. The fuseholder can handle fuses rated up to 20A when the proper spring for the fuse size is installed. The SFRB4 is a bayonet knob in-line fuseholder.
  • Bayonet knob for secure fuse retention and easy access
  • Designed for FSFE fuses, accommodating ratings up to 20A (with proper spring)
  • Rated for 32V DC operation
  • Nickel-plated phosphor-bronze fuse clips for excellent conductivity
  • UL Listed for safety and reliability

Specifications

Amperage Rating
4 A
Application
32 V Automotive & Electronic circuits
Brand Name
Ferraz Shawmut
Connection
Bare Wire Termination
Current Rating
4 A
Mounting
Wire
Mounting Type
In-Line
Series
SFRB
Special Features
Molded body and knob are Black Thermoset (UL 94V0). Body and knob have .20" diameter hole for insulated wire. Knob is bayonet-lock type metal insert. Ambient temperature is -40 degrees C to +125 degrees C. Contact rivets are tin-plated brass designed for use with #14 AWG stranded wire. Includes fuse listed and 19" loop of #14 AWG red insulated wire.
Type
Glass Fuse Holder
Voltage Rating
32 VAC
Package Dimensions (L x W x H)
1.84 IN x 0.42 IN x 0.42 IN
Package Dimensions (L x W x H)
4.6736 cm x 10.668 mm x 10.668 mm
Package Weight (Imperial)
0.060 L
Package Weight (Metric)
0.027 kg
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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.