Mersen T301294 - Square Body High-Speed Fuse Protistor® Size 72 aR 850VAC IEC 900VAC UL 1000A With Striker Flush ends metric threads
Mersen

T301294

Alternate Item Number: PC72UD85V1000TF


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Overview

Mersen Protistor® Size 72 aR square body high-speed fuse-links (SKU: T301294) deliver ultra-fast semiconductor protection for power conversion equipment. These IEC 900VAC / UL 1000VAC rated fuses are engineered for diodes, thyristors, and IGBT devices, offering exceptional interrupting ratings up to 150kA at 126kA²s pre-arcing I²t and 167kA²s clearing I²t. The square body design with flush metric threads ensures compatibility with global mounting standards, while the silver-plated contact surfaces and non-magnetic hardware minimize electrical resistance and thermal losses. Each fuse-link incorporates die-cut fuse elements embedded in solidified sand for optimized arc control, reducing I²t values and enhancing protection efficiency. Available with optional low-voltage trip indicators for microswitch activation, these fuses support field monitoring without additional wiring complexity. With power dissipation ratings from 80W to 260W depending on current rating (400A–1400A), Protistor® Size 72 fuses balance thermal performance with compact footprint (0.85–1.16kg). Ideal for industrial inverters, motor drives, and renewable energy systems, these fuses provide reliable fault isolation in high-dV/dt environments where semiconductor protection is critical. Compliance with IEC and UL standards ensures global market acceptance.
  • Ultra-fast aR protection for diodes, thyristors, and IGBTs
  • IEC 900VAC / UL 1000VAC rated with 150kA interrupting capacity
  • Square body with flush metric threads for global mounting compatibility
  • Silver-plated contacts and non-magnetic hardware reduce resistance
  • Optional trip indicator for field-mountable microswitch activation

Specifications

AC Voltage Rating
900 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
End Contact with Threaded Holes
Connection Type
Metric threads, flush ends
Current Rating
1000A
Material
Silver-plated, non-magnetic hardware
Mounting
Bolted
Mounting Type
Square body, Striker
Series
Protistor®
Size
Size 72
Size
2.91 x 2.32 x 2.48 in
Size
74 x 59 x 63 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
900 V
Voltage Rating
850VAC/900VAC/1250VAC/1300VAC
Wattage
136 W
Package Dimensions (L x W x H)
2.91 in x 2.32 in x 2.48 in
Package Dimensions (L x W x H)
74 mm x 59 mm x 63 mm
Package Weight (Imperial)
1.764 lb
Package Weight (Metric)
0.800 kg
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9F61 Size B Clips 1.6in

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9F61 Size B Clips 1.6in
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.