Mersen SFRB7-1/2 - 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 7.5 Amps SFRB series.
Mersen

SFRB7-1/2

Alternate Item Number: 782001244415

UPC: 782001244415

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Multiplier: 10

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Overview

The Mersen SFRB7-1/2 Bayonet Knob In-Line Fuseholder (SKU: SFRB7-1/2) is a compact, UL-listed fuseholder designed for low-voltage industrial applications up to 32V AC/DC. Engineered for use with Mersen FSFE fast-acting glass fuses (7.5A rating), this in-line fuseholder provides reliable circuit protection in control panels, machinery enclosures, and electrical equipment where space is limited. The bayonet knob mechanism enables tool-free fuse replacement, reducing maintenance downtime. The fuseholder features nickel-plated phosphor-bronze fuse clips for optimal conductivity and durability, with two eyelet holes for secure mounting using 3/16" (4.8mm) screws spaced 2.25" (57.2mm) apart. Rated for 7.5A at 32V, the SFRB7-1/2 is compatible with FSFE fuses ranging from 4A to 30A when paired with the correct spring for the fuse size. Its nickel-plated construction ensures long-term reliability in industrial environments. Typical applications include control circuits, auxiliary power supplies, lighting systems, and motor control components in manufacturing equipment, automation systems, and industrial machinery. The SFRB7-1/2 is manufactured in the US by Mersen, a global leader in electrical protection and power management solutions, and is distributed by Gross Automation. UL-listed for low-voltage fuse systems.
  • UL-listed for low-voltage applications up to 32V AC/DC
  • Compatible with Mersen FSFE fast-acting glass fuses (4A to 30A)
  • Bayonet knob for tool-free, quick fuse replacement
  • Nickel-plated phosphor-bronze fuse clips for durability
  • Mounting: 3/16" screws, 2.25" centers

Specifications

Amperage Rating
7.5 A
Application
32 V Automotive & Electronic circuits
Brand Name
Ferraz Shawmut
Connection
Bare Wire Termination
Current Rating
7.5 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.