Mersen R302718 - Square Body High-Speed Fuse Protistor® Size 73 aR 900VAC IEC 1000VAC UL 1000A With Striker Plain Blades
Mersen

R302718

Alternate Item Number: PC73UD90V10CPA


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Overview

The Mersen R302718 is a Size 73 aR Protistor® square body high-speed fuse-link designed for ultimate semiconductor protection. Engineered with die-cut elements embedded in solidified sand, this fuse offers controlled arcing characteristics, resulting in a lower I²t and a high interrupting rating of 150 kA. It is rated for 1000A, with a rated voltage of 900VAC (IEC) and 1000VAC (UL). The fuse features plain blades for mounting and a striker for trip indication. Its construction includes silver-plated contact surfaces and non-magnetic hardware, ensuring optimal performance and reliability. This fuse-link is ideal for protecting diodes, thyristors, and IGBT devices in power conversion equipment. It can be equipped with a low-voltage trip-indicator that operates a field-mountable microswitch for enhanced system monitoring. The Protistor® series provides maximum flexibility in equipment design and is available in various body sizes and mounting styles to meet diverse application needs. Key specifications include a pre-arcing I²t of 370 kA²s and a clearing I²t at rated voltage of 1920 kA²s. Power dissipation at rated current is 174W, with a package weight of 1.16 kg for a 3-unit pack. Manufacturer: Mersen. SKU: R302718. UNSPSC Code: 39121628. Country of Origin: US.
  • Mersen Protistor® Size 73 aR square body fuse-link
  • 1000A rated current
  • 900VAC (IEC) / 1000VAC (UL) rated voltage
  • 150 kA interrupting rating
  • Designed for semiconductor protection (diodes, thyristors, IGBTs)

Specifications

AC Voltage Rating
1000 V
Amperage Rating
1000 A
Application
Protection of inverters, motor drives, UPS systems and similar 690V or less equipments.
Brand Name
Mersen
Case
Ceramic
Connection
Plain Blades
Mounting
Clip
Size
5.88 x 2.87 x 3.09 in
Size
149.4 x 73 x 78.5 mm
Special Features
Multiple body sizes and terminals or blades combination aR Class according to IEC 60269-4 and VDE 636-23 Very low I²t for improved semiconductor protection Ultra fast acting Current limiting Superior cycling capability
Standard
IEC 60269-4 Compliance UL/CSA Recognized E76491 CCC GB 13539.4 for Asian market only
Sub Brand
Protistor®
Type
Square Body High-Speed Fuse-Links AC Protection
Type Of Indicators
Striker
Voltage Rating
1000 V
Wattage
174 W
Package Dimensions (L x W x H)
5.88 in x 2.87 in x 3.09 in
Package Dimensions (L x W x H)
149.4 mm x 73 mm x 78.5 mm
Package Weight (Imperial)
2.557 lb
Package Weight (Metric)
1.160 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.