Mersen A080431 - High-Speed Cylindrical Fuse Protistor® Size 20x127 gR (gRD) 1500VDC IEC 25A
Mersen

A080431

Alternate Item Number: FD20GD150V25


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Overview

The Mersen A080431 Protistor® is a high-speed cylindrical fuse designed for DC applications requiring precise fault interruption. This 20x127mm gR (gRD) rated fuse delivers fast-acting, full-range protection for auxiliaries, control circuits, and measuring/monitoring devices in DC systems. With a 1500VDC rating and 25A current capacity, it ensures reliable operation against overcurrents and short circuits. The fuse meets IEC standards, making it suitable for industrial DC power applications where rapid fault clearance is critical. Its 20x127mm dimensions ensure compatibility with standard fuse holders. Manufactured in the USA, this fuse combines robust performance with strict quality control. Key specs include 50kA rated breaking capacity, 4.25W power dissipation at rated current, and pre-arcing I²t of 37 A²s with clearing I²t of 580 A²s at rated voltage. Ideal for sensitive DC equipment requiring high-speed protection.
  • 25A rated current with 1500VDC voltage rating
  • 50kA breaking capacity for high fault current protection
  • Pre-arcing I²t: 37 A²s, Clearing I²t: 580 A²s at rated voltage
  • 4.25W power dissipation at rated current
  • 20x127mm cylindrical size compatible with standard fuse holders

Specifications

Amperage Rating
25 A
Application
DC control circuit, measuring & monitoring auxiliaries circuit
Brand Name
Mersen
Case
Ceramic
Connection
Ferrule
Connection Type
Standard fuse holder
Current Rating
25A
DC Voltage Rating
1500 V
Material
Cylindrical fuse construction
Mounting
Clip
Mounting Type
Cylindrical fuse mounting
Series
Protistor®
Size
5 x 0.81 in
Size
127 x 20.6 mm
Size
20x127mm
Special Features
International 20x127mm (13/16" x 5") for worldwide acceptance gR Class according to VDE 636-23 and IEC 60269-4 Low I²t for improved semiconductor protection Eliminate all overloads Extremely fast acting Current limiting Excellent cycling capability
Standard
UL Recognized for some ratings UL file No. E76491 IEC 60269-4 Compliance
Sub Brand
Protistor®
Type
IEC High-Speed Cylindrical Fuse-Links DC Protection
Voltage Rating
1500 V
Wattage
12 W
Package Dimensions (L x W x H)
5 in x 0.81 in x 0.81 in
Package Dimensions (L x W x H)
127 mm x 20.6 mm x 20.6 mm
Package Weight (Imperial)
0.214 lb
Package Weight (Metric)
0.097 kg
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POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.

LCC5

POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.
9F61 Size B Clips 1.6in

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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.