Mersen SFRT7-1/2 - 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 SFRT series.
Mersen

SFRT7-1/2

Alternate Item Number: 782001244354

UPC: 782001244354

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Overview

The Mersen SFRT7-1/2 is a UL Listed, bayonet knob in-line fuseholder designed for reliable electrical protection in low-voltage DC and AC circuits. This model, SKU SFRT7-1/2, is specifically engineered to accommodate Mersen's FSFE series of glass body, fast-acting fuses. It operates at a maximum of 32 Volts and is supplied with a 7.5 Ampere FSFE fuse. A key feature of the SFRT series is its adaptability; when equipped with the appropriate spring for the specific fuse size, it can accept FSFE fuses rated up to 20 Amperes. This makes the SFRT7-1/2 versatile for applications where fuse requirements may vary or need to be upgraded without replacing the entire fuseholder assembly. The bayonet knob design ensures easy and secure fuse insertion and removal with a positive lock. Its in-line mounting facilitates straightforward integration into wiring harnesses and electrical systems. Constructed for durability, this fuseholder is built to withstand industrial conditions, ensuring long-term reliability. The Mersen SFRT7-1/2 is an integral component for safeguarding electrical circuits against overcurrents and short circuits, commonly found in control panels, machinery, and automotive systems. Professionals prioritize ease of installation, secure connections, and adherence to safety standards, all of which the SFRT7-1/2 meets with its user-friendly design and high-quality manufacturing. Its ability to accept a range of FSFE fuse amperages (up to 20A with the correct spring) simplifies inventory management for maintenance and engineering teams, making it a cost-effective and practical choice for various industrial electrical protection needs. The fuseholder is supplied with 15" of #14 AWG red vinyl insulated wire and three springs of different lengths to accommodate various FSFE fuse sizes.
  • Bayonet knob design for easy and secure fuse access.
  • In-line mounting for straightforward integration.
  • Compatible with Mersen FSFE glass body, fast-acting fuses.
  • Rated for 32V maximum; supplied with 7.5A fuse.
  • Adaptable to FSFE fuses up to 20A with correct spring.

Specifications

Amperage Rating
7.5 A
Application
Electronic circuits
Brand Name
Ferraz Shawmut
Connection
Bare Wire Termination
Current Rating
7.5 A
Mounting
Wire
Mounting Type
In-Line
Series
SFRT
Special Features
Molded black thermoplastic (UL 94V2).Ambient temperature is -40 degrees C to +75 degrees C. Contact rivets are tin-plated brass designed for use with #14 AWG. Includes fuse listed and 19" loop of #14 AWG red vinyl 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.