Mersen M300552 - Square Body High-Speed Fuse Protistor® Size 71 aR 1100VAC IEC 1200VAC UL 550A With Striker DIN 110 Blades
Mersen

M300552

Alternate Item Number: PC71UD11C550D1A

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Overview

The Mersen M300552 Protistor® fuse-link is a high-performance aR ultra-fast acting square body fuse designed for maximum protection in power conversion equipment. Rated for 550A continuous current with a voltage rating of 1100VAC/1200VAC, this Size 71 fuse-link provides state-of-the-art semiconductor protection for diodes, thyristors, and IGBT devices. The fuse elements are die-cut and embedded in solidified sand, optimizing arcing characteristics to deliver a lower I²t and high interrupting rating. All contact surfaces are silver-plated for superior conductivity, and non-magnetic hardware ensures long-term reliability. The M300552 is available with a low-voltage trip-indicator that can actuate a field-mountable microswitch for remote status monitoring. Designed for global compatibility, this fuse-link features DIN 110 blades for secure mounting in industrial applications. Ideal for power electronics, motor drives, and renewable energy systems where precise fault protection is critical. The Protistor® series from Mersen delivers engineered reliability for modern high-voltage applications. This fuse-link meets IEC 1200VAC and UL standards, ensuring compliance with international safety and performance requirements. The square body design enhances mechanical strength and thermal management, while the aR (fast-acting) classification provides rapid response to fault conditions, minimizing damage to sensitive semiconductor components. The striker mechanism enables direct mechanical actuation of protective devices, improving system safety and reducing downtime. With a high interrupting rating, the M300552 effectively interrupts fault currents up to its rated capacity, protecting downstream equipment from catastrophic failure. Its compact Size 71 form factor allows for efficient integration into high-density power conversion systems, making it a preferred choice for industrial and renewable energy applications where reliability and performance are paramount.
  • 550A rated current with 1100VAC/1200VAC voltage rating
  • aR ultra-fast acting for semiconductor protection (diodes, thyristors, IGBTs)
  • Square body Size 71 with DIN 110 blades for secure mounting
  • Silver-plated contacts and non-magnetic hardware for reliability
  • Optional low-voltage trip-indicator for remote status monitoring

Specifications

AC Voltage Rating
1200 V
Amperage Rating
550 A
Application
Protection of inverters, motor drives, UPS systems and similar 690V or less equipments.
Brand Name
Mersen
Case
Ceramic
Connection
DIN Type Blades
Mounting
Bolted
Size
5.25 x 2.01 x 2.22 in
Size
133.4 x 51 x 56.5 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
1200 V
Wattage
112 W
Package Dimensions (L x W x H)
5.25 in x 2.01 in x 2.22 in
Package Dimensions (L x W x H)
133.4 mm x 51 mm x 56.5 mm
Package Weight (Imperial)
1.146 lb
Package Weight (Metric)
0.520 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.