Mersen A50QS325-4 - High Speed Fuse Amp-Trap® A50QS 500VAC 500VDC 325A Blade
Mersen

A50QS325-4

Alternate Item Number: A50QS325-4

UPC: 782001947903


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Overview

The Mersen A50QS325-4 Amp-Trap® Form 101 high-speed fuse is engineered for superior protection in dynamic solid-state equipment operating at 500VAC or 500VDC. With a continuous current rating of 325A, this fuse delivers the lowest I²t in its class, minimizing damage to protected components during fault conditions. Its 200kA interrupting rating (AC) and 87kA (DC) ensure reliable handling of extreme fault currents. Designed for cyclic loading, the A50QS325-4 extends operational life in demanding applications such as motor drives, inverters, and UPS systems. The compact design optimizes equipment footprint without compromising performance. Certified to UL standards (File 60314) and CSA, this fuse meets stringent safety and reliability requirements. It is specifically optimized for protecting sensitive semiconductor circuits, reducing watts loss for cooler operation and lowering stress on downstream components during fault clearing. The A50QS325-4 provides dependable high-speed fault protection in 500V systems, ensuring minimal downtime and enhanced system integrity.
  • 500VAC/VDC rated for versatile AC/DC applications
  • 325A current rating with 200kA (AC) and 87kA (DC) interrupting ratings
  • Lowest I²t for superior semiconductor circuit protection
  • Optimized for cyclic loading with extended operational life
  • UL recognized (File 60314) and CSA certified for compliance

Specifications

AC Voltage Rating
500 V
Amperage Rating
325 A
Application
Protection of 500V or less motor drives, UPS, inverters, etc.
Brand Name
Mersen
Case
GMG
Case Material
GMG
Connection
Blade
DC Voltage Rating
500 V
Mounting
Bolted
Mounting
Bolt
Size
4.34 x 1.5 in
Size
110.236 x 38.1 mm
Size
4.34 x 1.5;110.236 x 38.1 in;mm
Special Features
Lowest I2t for greatest protection of semiconductor circuits Low watts loss for cooler operation Superior cycling ability gives an equipment design advantage State-of-the-art protection for 500V equipment Ultra compact sizes allow down-sizing of existing equipment
Standard
UL recognized component UL File 60314 AC: UL guide no. JFHR2 DC Tested to UL standard 198L parameters (70-1200A) CSA Certified LR12636
Sub Brand
Amp-Trap®
Type
Round Body High-Speed Fuse-Links AC Protection
Voltage Rating
500 V
Voltage Rating
500 V V
Package Dimensions (L x W x H)
4.34 in x 1.5 in x 1.5 in
Package Dimensions (L x W x H)
110.236 mm x 38.1 mm x 38.1 mm
Package Weight (Imperial)
0.680 lb
Package Weight (Metric)
0.308 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.

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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.