Mersen R076651 - British Standard fuse-link Protistor® 17x27 aR 250V AC UL 25A
Mersen

R076651

Alternate Item Number: BS17US25V25


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Specification Sheet

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Overview

The Mersen Protistor® R076651 British Standard fuse-link (17x27 mm) is a high-speed cylindrical fuse designed for semiconductor protection in AC applications up to 250V. This aR-class fuse meets IEC 60269-1 and -4 standards, ensuring compliance with global electrical safety regulations. With a rated current of 25A and a breaking capacity of 160kA, it provides robust protection against overcurrent events in power semiconductor circuits. The fuse-link operates efficiently with a power dissipation of 8.5W at rated current, maintaining system stability during normal operation. Designed without a blown fuse indicator, it is ideal for compact installations where space is a premium. The Protistor® series is UL recognized and adheres to VDE 636-23 standards, making it suitable for industrial, renewable energy, and motor drive applications. Its high interrupting rating ensures reliable operation in high-fault current scenarios, reducing downtime and equipment damage.
  • Rated current: 25A for semiconductor protection circuits
  • Voltage rating: 250V AC (IEC) / 250V AC (UL)
  • Breaking capacity: 160kA for high-fault current protection
  • aR class compliance: IEC 60269-1 and -4, VDE 636-23
  • Compact 17x27mm cylindrical design without indicator
  • UL recognized and British Standard compliant
  • Power dissipation: 8.5W at rated current

Specifications

AC Voltage Rating
1
Amperage Rating
25 A
Brand Name
Mersen
Case
Ceramic
Current Rating
25 A
Mounting
Bolted
Series
Protistor®
Size
2.14 x 0.73 in
Size
54.4 x 18.5 mm
Size
17x27
Standard
UL Recognized
Sub Brand
Protistor®
Type
British Standard High-Speed Fuse-Links AC Protection
Voltage Rating
1
Voltage Rating
250 V AC
Wattage
4.8 W
Package Dimensions (L x W x H)
2.14 in x 0.73 in x 0.73 in
Package Dimensions (L x W x H)
54.4 mm x 18.5 mm x 18.5 mm
Package Weight (Imperial)
0.061 lb
Package Weight (Metric)
0.028 kg
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British Standard fuse-link Protistor® 17x27 aR 250V AC UL 35A With Striker
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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.