Mersen E300637 - Square Body High-Speed Fuse Protistor® Size 73 aR 1000VAC IEC 1100VAC UL 900A With Striker Open Slot Blades
Mersen

E300637

Alternate Item Number: PC73UD10C900EF


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Overview

The Mersen E300637 Protistor® Square Body High-Speed Fuse (SKU: E300637) is specifically designed for critical semiconductor protection in demanding industrial power conversion applications. Engineered for ultra-fast acting performance, this fuse-link provides precise fault interruption for sensitive electronic components such as diodes, thyristors, and IGBT devices. It boasts a robust voltage rating of 1000 VAC according to IEC standards and 1100 VAC per UL specifications, coupled with a substantial 900A current rating. The 'aR' designation signifies its suitability for protecting power semiconductor devices. The innovative square body design of the E300637 offers significant mounting flexibility, accommodating multiple worldwide fuse holder styles and simplifying equipment design integration. Internally, the fuse elements are embedded in solidified sand, a material chosen for its effectiveness in controlling arc energy and mitigating explosive events. This construction method results in a lower I²t value, crucial for minimizing thermal stress on protected components during a fault, and contributes to its high interrupting capability. For optimal electrical performance and longevity, all contact surfaces on the Mersen E300637 are silver-plated to ensure superior conductivity and reduced resistance. The use of non-magnetic hardware further enhances operational stability, particularly in environments with strong magnetic fields. This fuse-link is compatible with Size 73 fuse holders and assemblies, making it a direct replacement or upgrade option for existing systems. An optional low-voltage trip indicator feature is available, which can actuate field-mountable microswitches for immediate remote fault signaling, enhancing system monitoring and maintenance efficiency. The Mersen E300637 is manufactured in the US and adheres to stringent quality standards for reliable operation in high-power industrial settings.
  • Mersen Protistor® Square Body High-Speed Fuse
  • 900A Current Rating, 1000VAC IEC / 1100VAC UL Voltage Rating
  • aR Type for Semiconductor Protection
  • Size 73 with Open Slot Blades for secure connection
  • Die-cut elements embedded in solidified sand for arc control

Specifications

AC Voltage Rating
1100 V
Amperage Rating
900 A
Application
Protection of inverters, motor drives, UPS systems and similar 690V or less equipments.
Brand Name
Mersen
Case
Ceramic
Connection
Open Slot Blades
Connection Type
Open Slot Blades
Current Rating
900A
Material
embedded in solidified sand
Material
Silver-plated, non-magnetic hardware
Mounting
Bolted
Series
Protistor®
Size
5.88 x 2.87 x 3.09 in
Size
149.4 x 73 x 78.5 mm
Size
Size 73
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
1100 V
Voltage Rating
1000VAC IEC / 1100VAC UL
Voltage Rating
1000VAC (IEC) and 1100VAC (UL)
Wattage
170 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)
2.447 lb
Package Weight (Metric)
1.110 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.