Mersen S301707 - Square Body High-Speed Fuse Protistor® Size 71 gR 690VAC IEC 500A With Striker Flush ends metric threads
Mersen

S301707

Alternate Item Number: PC71GB69V500TF

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Overview

The Mersen Protistor® S301707 is a high-speed fuse-link engineered for superior semiconductor protection, offering full-range protection against both overloads and short circuits. This 'gR' class fuse operates at 690VAC (IEC) and features a 500A rated current. Its square body design, size 71, is compatible with various mounting styles, providing design flexibility for power conversion equipment. The fuse-link is constructed with pure silver, die-cut elements embedded in solidified sand to manage arcing characteristics, resulting in a low I²t value of 78.1 kA²s (pre-arcing) and 460 kA²s (clearing I²t at rated voltage). It boasts a high breaking capacity of 150 kA and a power dissipation of 69W at its rated current. The Protistor® S301707 features flush ends with metric threads for secure connections and can be equipped with a low-voltage trip-indicator for external signaling. All contact surfaces are silver-plated, and hardware is non-magnetic to ensure optimal performance and longevity. This fuse is ideal for applications requiring robust protection for sensitive semiconductor devices in industrial power systems. The fuse is designed for operation at a rated frequency of 50/60 Hz. It has a rated voltage of 690VAC and a rated current of 500A. The breaking capacity is 150 kA. The pre-arcing I²t is 78.1 kA²s, and the clearing I²t at rated voltage is 460 kA²s. The power dissipation at rated current is 69W. The fuse body is square, size 71. The ends are flush with metric threads. The fuse element is made of pure silver. The filling material is solidified sand. The fuse is designed for semiconductor protection. The fuse class is gR. The fuse is equipped with a striker for external signaling when fitted with a trip indicator. The contact surfaces are silver-plated. The hardware is non-magnetic. The fuse is compliant with IEC standards.
  • Mersen Protistor® S301707 high-speed fuse-link
  • Rated 500A, 690VAC (IEC) with gR protection class
  • Size 71 square body with flush ends and metric threads
  • Low I²t (78.1 kA²s pre-arcing, 460 kA²s clearing) for superior protection
  • High breaking capacity of 150 kA and 69W power dissipation

Specifications

AC Voltage Rating
690 V
Amperage Rating
500 A
Application
Protection of inverters, motor drives, UPS systems and similar 690V or less equipments.
Brand Name
Mersen
Case
Ceramic
Connection
End Contact with Threaded Holes
Mounting
Bolted
Size
2.91 x 2.01 x 2.22 in
Size
74 x 51 x 56.5 mm
Special Features
Excellent cycling capability Multiple body sizes and terminals or blades combination Extremely fast acting Eliminate all overloads Low I²t for improved semiconductor protection gR Class according to IEC 60269-4 and VDE 636-23
Standard
IEC 60269-4 Compliance
Sub Brand
Protistor®
Type
Square Body High-Speed Fuse-Links AC Protection
Type Of Indicators
Striker
Voltage Rating
690 V
Wattage
64 W
Package Dimensions (L x W x H)
2.91 in x 2.01 in x 2.22 in
Package Dimensions (L x W x H)
74 mm x 51 mm x 56.5 mm
Package Weight (Imperial)
1.133 lb
Package Weight (Metric)
0.514 kg
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9F61 Size B Clips 1.6in

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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.

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.