Mersen GSF1/4 - Miniature fuse GSF - Time-Delay 250VAC 0.25A Size 5x20 Ferrule
Mersen

GSF1/4

Alternate Item Number: GSF1/4

UPC: 782001244965


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Overview

The Mersen GSF1/4 (SKU: GSF1/4) is a time-delay miniature fuse engineered for reliable overcurrent protection in sensitive electronic and control systems. Featuring a robust ceramic body and a standard 5x20mm ferrule size, this fuse offers excellent thermal management and arc suppression capabilities. It is precisely rated for 250VAC and a low current of 0.25A, making it ideal for safeguarding delicate instrumentation and control circuits. The time-delay characteristic is crucial for applications experiencing temporary inrush currents, preventing nuisance tripping while ensuring prompt interruption of sustained overloads. This fuse adheres to IEC-127-2 Standard Sheet 5 and holds UL and CSA recognition, confirming its dependable performance across industrial, telecommunications, and medical equipment sectors. Key specifications include a ceramic body, time-delay operation, 5x20mm dimensions, 250VAC voltage rating, 0.25A current rating, and a significant 1500A interrupting rating at 250VAC. Its construction ensures durability and consistent protection.
  • Time-delay operation for handling inrush currents
  • Durable ceramic body for thermal management and arc suppression
  • Standard 5x20mm ferrule size for broad compatibility
  • Rated 250VAC and 0.25A for sensitive electronic protection
  • UL and CSA recognized, compliant with IEC-127-2 Standard Sheet 5

Specifications

AC Voltage Rating
250 V
Amperage Rating
0.25 A
Application
Electronic circuits
Brand Name
Mersen
Case
Ceramic
Case Material
Ceramic
Class
Supplemental
Connection
Ferrule
Connection Type
Ferrule
Current Rating
0.25 A
Material
Ceramic
Mounting
Clip
Series
GSF
Size
0.79 x 0.2 in
Size
20.066 x 5.08 mm
Size
5mm x 20mm
Size
5x20mm
Size
0.79 x 0.2;20.066 x 5.08 in;mm
Special Features
Ceramic body Time-delay 5 mm x 20 mm
Standard
1/2A through 8/10A, 250VAC 1A through 6-3/10A, 250VAC, SEMKO, VDE Approved 1A through 10A, 250VAC, UL and CSA Recognized IEC-127-2 Standard Sheet 5
Type
5x20mm
Voltage Rating
250 VAC
Package Dimensions (L x W x H)
0.79 in x 0.2 in x 0.2 in
Package Dimensions (L x W x H)
20.066 mm x 5.08 mm x 5.08 mm
Package Weight (Imperial)
0.010 lb
Package Weight (Metric)
0.005 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.