Mersen SFRB20 - 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 20 Amps SFRB series.
Mersen

SFRB20

Alternate Item Number: 782001244446

UPC: 782001244446

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Minimum Qty: 10

Multiplier: 10

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Overview

The Mersen SFRB20 (SKU: SFRB20) is an in-line fuseholder designed for FSFE fuses, offering reliable overcurrent protection in low-voltage DC applications. This SFRB series fuseholder features a convenient bayonet knob for quick and secure fuse replacement, minimizing downtime. It is rated for a maximum of 32 Volts and up to 20 Amps, contingent on the installation of the correct spring for the specific FSFE fuse size. The FSFE fuses themselves are available in ratings from 4A to 30A at 32V, with lengths ranging from 5/8" for the 4A version to 1-7/16" for the 30A version. The SFRB20 is engineered for durability and consistent electrical contact, making it suitable for demanding industrial environments. Its in-line mounting style and robust construction ensure it can withstand challenging conditions. This fuseholder is a critical component for safeguarding electrical circuits and sensitive equipment in automotive, marine, telecommunications, and general industrial machinery applications where dependable low-voltage protection is essential. Mersen is a globally recognized leader in electrical protection and power management, ensuring quality and innovation in their products. The SFRB20 provides a straightforward, safe, and efficient solution for fuse protection needs.
  • In-line fuseholder with bayonet knob for FSFE fuses
  • Rated for 32 Volts maximum
  • Rated for up to 20 Amps (with proper spring)
  • Designed for reliable low-voltage DC circuit protection
  • Durable construction for industrial environments

Specifications

Amperage Rating
20 A
Application
32 V Automotive & Electronic circuits
Brand Name
Ferraz Shawmut
Connection
Bare Wire Termination
Current Rating
20 A
Mounting
Wire
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.