Mersen L234058 - Square Body High-Speed Fuse Protistor® Size 73 gR 450VDC IEC 500VDC UL 800A With Striker Flush ends metric threads
Mersen

L234058

Alternate Item Number: D73GB45V800TFB


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Overview

The Mersen L234058 Protistor® fuse-link (SKU: L234058) is a Size 73, high-speed fuse engineered for critical semiconductor protection in power conversion systems. This gR-rated fuse is designed for DC applications with a rated voltage of 450VDC, also meeting IEC standards up to 500VDC and UL standards up to 500VDC. It provides robust protection with an 800A current rating, safeguarding sensitive devices such as diodes, thyristors, GTOs, and IGBTs. Constructed with pure silver die-cut elements embedded in solidified sand, this fuse-link offers controlled arcing characteristics, resulting in a lower I²t and a high interrupting rating. The square body design with flush ends and metric threads ensures flexible equipment layout and secure mounting. Contact surfaces are silver-plated, and all hardware is non-magnetic for optimal performance. This model can be equipped with a low-voltage trip-indicator for enhanced system monitoring and safety. Key specifications include a rated breaking capacity of 150 kA (IEC and UL), a pre-arcing I²t of 189 kA²s, and a clearing I²t at rated voltage of 6,600 kA²s. Power dissipation at rated current is 148W. The L234058 is compliant with IEC 60269-4 and is UL recognized (File E76491). Its dimensions and mounting style are optimized for modern industrial power systems, offering reliable protection for demanding applications.
  • Mersen Protistor® Size 73 gR Fuse-Link
  • 800A Current Rating
  • 450VDC / 500VDC Voltage Rating
  • Square Body with Flush Ends and Metric Threads
  • High-Speed Semiconductor Protection

Specifications

Amperage Rating
800 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
Connection Type
metric threads
Current Rating
800 A
DC Voltage Rating
500 V
Material
Silver
Mounting
Bolted
Mounting Type
Flush ends
Series
Protistor®
Size
Size 73
Size
2.91 x 2.87 x 3.09 in
Size
74 x 73 x 78.5 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
500 V
Voltage Rating
450 VDC / 500 VDC
Wattage
96 W
Package Dimensions (L x W x H)
2.91 in x 2.87 in x 3.09 in
Package Dimensions (L x W x H)
74 mm x 73 mm x 78.5 mm
Package Weight (Imperial)
2.436 lb
Package Weight (Metric)
1.105 kg
Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount

GPM-SRR90

Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount
Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20

C331156

Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20
Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8

1SCM8

Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8
Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20
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.
9F61 Size B Clips 1.6in

9F61BWW460

9F61 Size B Clips 1.6in

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.