Mersen B300519 - Square Body High-Speed Fuse Protistor® Size 71 aR 1250VAC IEC 1300VAC UL 315A With Striker Flush ends metric threads
Mersen

B300519

Alternate Item Number: PC71UD13C315TF


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Overview

The Mersen B300519 Protistor® aR fuse-link (SKU B300519) delivers ultra-fast semiconductor protection for high-power applications. Designed for diodes, thyristors, and IGBTs, this square-body fuse features flush ends with metric threads for flexible installation in modern power conversion equipment. Rated at 315A, it meets IEC 1250VAC and UL 1300VAC standards, ensuring compatibility with global electrical systems. The fuse's internal construction uses die-cut elements embedded in solidified sand to optimize arcing characteristics, reducing I²t values and enhancing interrupting capacity. With a rated breaking capacity of 126kA and power dissipation of 76W at 315A, it provides reliable protection under fault conditions. All contact surfaces are silver-plated for low resistance, and non-magnetic hardware ensures consistent performance in high-frequency environments. An optional low-voltage trip-indicator can be added to activate remote signaling via a microswitch. Manufactured in Mexico, this fuse-link is part of Mersen's Protistor® series, trusted for semiconductor protection in industrial, renewable energy, and traction applications.
  • Ultra-fast acting aR fuse for semiconductor protection (diodes, thyristors, IGBTs)
  • Rated 315A, 1250VAC (IEC) / 1300VAC (UL) with 126kA interrupting rating
  • Square body design with flush ends and metric threads for flexible installation
  • Silver-plated contacts and non-magnetic hardware for high-frequency performance
  • Optional low-voltage trip-indicator for remote signaling via microswitch

Specifications

AC Voltage Rating
1300 V
Amperage Rating
315 A
Application
Protection of inverters, motor drives, UPS systems and similar 690V or less equipments.
Brand Name
Mersen
Case
Ceramic
Connection
End Contact with Threaded Holes
Current Rating
315A
Material
Solidified sand, Silver-plated contact surfaces
Mounting
Bolted
Mounting Type
Flush ends metric threads
Series
Protistor®
Size
Size 71
Size
2.91 x 2.01 x 2.22 in
Size
74 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
1300 V
Voltage Rating
1250VAC IEC, 1300VAC UL
Wattage
73 W
Package Dimensions (L x W x H)
2.91 in x 2.01 in x 2.22 in
Package Dimensions (L x W x H)
74 mm x 51 mm x 56.5 mm
Package Weight (Imperial)
1.135 lb
Package Weight (Metric)
0.515 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.