Mersen Q075891 - British Standard fuse-link Protistor® 17x49 gR 690V AC UL 55A
Mersen

Q075891

Alternate Item Number: BS17US69V55


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Specification Sheet

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Overview

The Mersen Protistor® Q075891 is a British Standard gR class fuse-link engineered for the critical protection of power semiconductors. Adhering to IEC 60269-1 and -4 standards, this 17x49mm fuse-link offers a robust 690V AC voltage rating and a 55A current rating. Its design ensures effective clearing of all overloads, enhancing operational safety. The URS series fuse-link provides selective coordination capabilities within distribution circuits, including with aR class fuses (100A and above) as per VDE 636-23 and IEC 60269-4. Connections conform to German DIN 43653/00C and British BS88-4 standards. This UL Recognized fuse-link boasts an extremely high breaking capacity, making it ideal for protecting sensitive semiconductor devices in demanding industrial applications. Constructed with silica sand and die-cut fuse elements, it ensures reliable performance and longevity. Key specifications include a 690V AC rated voltage, 55A rated current, and a high breaking capacity of 200 kA at 690V. The pre-arcing I²t is 210 A²s and clearing I²t is 1380 A²s. Power dissipation at rated current is 6.8W. This fuse-link is designed for applications requiring fast acting protection for semiconductor devices, ensuring system integrity and preventing damage from overcurrents and short circuits.
  • British Standard gR class fuse-link for power semiconductor protection
  • 17x49mm size with 690V AC voltage rating and 55A current rating
  • IEC 60269-1 and -4 compliant
  • High breaking capacity (200 kA at 690V)
  • UL Recognized for reliable industrial applications

Specifications

AC Voltage Rating
1
Amperage Rating
55 A
Brand Name
Mersen
Case
Ceramic
Connection Type
German standard DIN 43653/00C, British standard BS88-4
Connection Type
DIN 43653/00C, BS88-4
Current Rating
55A
Material
Silica Sand
Mounting
Bolted
Series
URS
Series
Protistor®
Size
17x49 mm
Size
17x49
Size
3.04 x 0.73 in
Size
77.2 x 18.5 mm
Sub Brand
Protistor®
Type
British Standard High-Speed Fuse-Links AC Protection
Voltage Rating
690V AC
Voltage Rating
1
Wattage
13.3 W
Package Dimensions (L x W x H)
3.04 in x 0.73 in x 0.73 in
Package Dimensions (L x W x H)
77.2 mm x 18.5 mm x 18.5 mm
Package Weight (Imperial)
0.086 lb
Package Weight (Metric)
0.039 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.