Mersen GSF2-1/2 - Miniature fuse GSF - Time-Delay 250VAC 2.5A Size 5x20 Ferrule
Mersen

GSF2-1/2

Alternate Item Number: GSF2-1/2

UPC: 782001245061


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Overview

The Mersen GSF2-1/2 Miniature Fuse (SKU: GSF2-1/2) is a time-delay (slow-blow) fuse designed for reliable overcurrent protection in sensitive electronic circuits. Rated at 250VAC and 2.5A, this 5x20mm ceramic fuse is ideal for applications where temporary inrush currents are common, such as power supplies, motor controls, lighting ballasts, and instrumentation. The ceramic body provides superior thermal management and arc suppression, ensuring safe operation under demanding conditions. Unlike fast-acting fuses, the time-delay characteristic allows the GSF2-1/2 to tolerate harmless surges while still interrupting sustained overloads or short circuits to prevent damage and fire hazards. This fuse is UL and CSA recognized, SEMKO and VDE approved, and complies with IEC 127-2 standards. Its compact size and ferrule terminals make it easy to integrate into crowded electrical enclosures or compact devices. Trust Mersen’s GSF series for consistent, high-integrity circuit protection in industrial and commercial applications.
  • 250VAC voltage rating for broad AC power applications
  • 2.5A current rating for moderate current circuits
  • Time-delay (slow-blow) design tolerates temporary inrush currents
  • Ceramic body for superior thermal management and arc suppression
  • 5x20mm compact size with ferrule terminals for easy integration
  • UL and CSA recognized; SEMKO and VDE approved
  • IEC 127-2 compliant for international standards

Specifications

AC Voltage Rating
250 V
Amperage Rating
2.5 A
Application
Electronic circuits
Brand Name
Mersen
Case
Ceramic
Case Material
Ceramic
Class
Supplemental
Connection
Ferrule
Mounting
Clip
Size
0.79 x 0.2 in
Size
20.066 x 5.08 mm
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.