Mersen GSD1/2 - Miniature fuse GSD - Fast-Acting 250VAC 0.5A Size 5x20 Ferrule
Mersen

GSD1/2

Alternate Item Number: GSD1/2

UPC: 782001244576


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Overview

The Mersen GSD1/2 miniature fuse (SKU: GSD1/2) is a fast-acting, 250VAC-rated overcurrent protection device designed for critical electronic and industrial applications. This 0.5A fuse features a 5x20mm ceramic ferrule construction, ensuring superior thermal resistance and mechanical durability for reliable operation in demanding environments. Engineered to IEC 127-2 standards, the GSD1/2 provides rapid fault current interruption to protect sensitive downstream components from overloads and short circuits, minimizing equipment damage and downtime. The fast-acting (F) characteristic ensures quick response to fault conditions, making it ideal for power supplies, control panels, instrumentation, and telecommunications equipment. With UL, CSA, SEMKO, and VDE certifications, the GSD1/2 meets stringent international safety and performance standards. Its compact ferrule design allows seamless integration into standard 5x20mm fuse holders, simplifying installation and replacement. Backed by Mersen’s reputation for high-quality electrical protection solutions, the GSD1/2 delivers predictable performance and long service life. Whether used in industrial automation, medical devices, or consumer electronics, this fuse provides precise overcurrent protection at 250VAC, ensuring operational continuity and system integrity.
  • Fast-acting fuse for rapid overcurrent protection
  • 250VAC voltage rating with 0.5A current rating
  • 5x20mm ceramic ferrule construction for durability
  • UL, CSA, SEMKO, and VDE certified
  • Compatible with standard 5x20mm fuse holders

Specifications

AC Voltage Rating
250 V
Amperage Rating
0.5 A
Application
Electronic circuits
Brand Name
Mersen
Case
Ceramic
Case Material
Ceramic
Class
Supplemental
Connection
Ferrule
Connection Type
Ferrule
Current Rating
0.5 A
Material
Ceramic
Mounting
Clip
Series
GSD
Size
0.79 x 0.2 in
Size
20.066 x 5.08 mm
Size
5mm x 20mm
Size
0.79 x 0.2;20.066 x 5.08 in;mm
Special Features
Ceramic body Fast-acting 5 mm x 20 mm
Standard
4/10A through 10A, 250VAC, UL & CSA Recognized 1A through 6-3/10A, 250 VAC, SEMKO Approved 1A through 6-3/10A, 250 VAC, VDE Approved IEC 127-2 Standard Sheet 1
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.