Mersen F300546 - Square Body High-Speed Fuse Protistor® Size 71 aR 1250VAC IEC 1300VAC UL 250A With Striker DIN 110 Blades
Mersen

F300546

Alternate Item Number: PC71UD13C250D1A


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Overview

The Mersen F300546 Protistor® Square Body High-Speed Fuse (SKU: F300546) is an ultra-fast acting aR fuse designed for semiconductor protection in power conversion equipment. Rated for 1250VAC (IEC) and 1300VAC (UL), this fuse-link provides advanced protection for sensitive semiconductor devices including diodes, thyristors, and IGBTs. The fuse features die-cut elements embedded in quartz sand, ensuring controlled arcing characteristics for reduced I²t and high interrupting ratings. With a rated current of 250A and a breaking capacity of 126kA, it delivers reliable performance in high-fault scenarios. Engineered for high-speed operation, the F300546 includes silver-plated contact surfaces and non-magnetic hardware for enhanced conductivity and durability. The fuse is equipped with DIN 110 blades and a striker for integration with trip mechanisms, enabling seamless compatibility with industrial protection systems. Optional low-voltage trip-indicators with field-mountable microswitches provide real-time monitoring and system safety alerts. Ideal for applications in power electronics, motor drives, renewable energy systems, and industrial automation, the Protistor® F300546 ensures precise fault isolation while minimizing downtime. Its compact square body design and robust construction make it suitable for panel mounting and DIN rail installations. Trusted by engineers for over 50 years, Mersen’s Protistor® series delivers uncompromising protection for critical power conversion infrastructure.
  • Ultra-fast acting aR fuse for semiconductor protection (diodes, thyristors, IGBTs)
  • Rated 250A, 1250VAC (IEC)/1300VAC (UL) with 126kA breaking capacity
  • Silver-plated contacts and non-magnetic hardware for high conductivity
  • DIN 110 blades with striker for trip mechanism integration
  • Optional low-voltage trip-indicator for system monitoring

Specifications

AC Voltage Rating
1300 V
Amperage Rating
250 A
Application
Protection of inverters, motor drives, UPS systems and similar 690V or less equipments.
Brand Name
Mersen
Case
Ceramic
Connection
DIN Type Blades
Connection Type
DIN 110 Blades
Current Rating
250A
Material
Silver-plated contact surfaces, non-magnetic hardware, die-cut elements in solidified sand
Material
Solidified sand
Material
Silver-plated, non-magnetic hardware
Mounting
Bolted
Mounting Type
DIN 110 Blades
Series
Protistor®
Size
5.25 x 2.01 x 2.22 in
Size
133.4 x 51 x 56.5 mm
Size
Size 71
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
1250VAC/1300VAC
Voltage Rating
1300 V
Voltage Rating
1250VAC IEC, 1300VAC UL
Wattage
61 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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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.