Mersen M302093 - Square Body High-Speed Fuse Protistor® Size 72 gR 550VDC IEC 600VDC UL 450A With Striker Flush ends metric threads
Mersen

M302093

Alternate Item Number: D72GB55V450TF


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Overview

The Mersen Protistor® fuse-link, SKU M302093, offers robust protection for modern power conversion equipment. Engineered with pure silver, die-cut elements embedded in solidified sand, this fuse-link provides superior semiconductor protection for diodes, thyristors, GTO's, and IGBT devices. Its square body design, Size 72, ensures maximum flexibility in equipment design and is available with multiple worldwide acceptable mounting styles. This specific model features flush ends with metric threads for secure connections. With a voltage rating of 550 VDC and IEC 600 VDC, and a substantial current rating of 450 A, the M302093 is built for demanding applications. The construction utilizes pure silver elements and solidified sand to control arcing characteristics, resulting in a lower I²t and a high interrupting rating level. All contact surfaces are silver-plated, and non-magnetic hardware is used throughout the fuse-link. For enhanced operational feedback, all Protistor® fuse-links can be equipped with a low voltage trip-indicator that can operate a field-mountable microswitch, providing clear indication of fuse operation. Key specifications include: - Manufacturer: Mersen - SKU: M302093 - Series: Protistor® - Size: 72 - Voltage Rating: 550 VDC / 600 VDC - Current Rating: 450 A - Material: Silver, Sand - Connection Type: Metric Threads - Standards: IEC, UL This fuse-link is designed to provide ultimate protection, ensuring the longevity and reliable operation of sensitive power electronic components.
  • High-speed protection for semiconductors (diodes, thyristors, GTO's, IGBTs)
  • 550 VDC / 600 VDC voltage rating
  • 450 A current rating
  • Size 72 square body with metric thread connections
  • Constructed with pure silver elements and solidified sand for optimal performance

Specifications

Amperage Rating
450 A
Application
Protection of inverters, motor drives, UPS systems and similar 600V or less equipments.
Brand Name
Mersen
Case
Ceramic
Connection
End Contact with Threaded Holes
DC Voltage Rating
600 V
Mounting
Bolted
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 gR Class according to IEC 60269-4 and VDE 636-23 Low I²t for improved semiconductor protection Extremely fast acting Eliminate all overloads Excellent cycling capability
Standard
IEC 60269-4 Compliance UL/CSA Recognized E76491 CCC GB 1359.4
Sub Brand
Protistor®
Type
Square Body High-Speed Fuse-Links DC Protection
Type Of Indicators
Striker
Voltage Rating
600 V
Wattage
67 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)
1.618 lb
Package Weight (Metric)
0.734 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.