Mersen A70QS50-4 - High Speed Fuse Amp-Trap® A70QS 700VAC 700VDC 50A Bolted Blade
Mersen

A70QS50-4

Alternate Item Number: A70QS50-4

UPC: 782001948627


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Overview

The Mersen A70QS50-4 Amp-Trap® high-speed fuse is engineered for superior protection of modern solid-state equipment. Developed to meet new equipment requirements for 700V systems, this fuse offers significantly lower I²t values, providing enhanced protection against overcurrents and short circuits. Its robust design ensures a longer operational life, particularly when subjected to cyclic loading, a common challenge in applications like motor drives and Uninterruptible Power Supplies (UPS). The A70QS series features lower watts loss compared to previous generations, contributing to cooler operation and increased system efficiency. With a voltage rating of 700VAC/VDC and a current rating of 50A, the A70QS50-4 is ideal for protecting dynamic solid-state devices. Key specifications include a 700V AC/DC rating, very low I²t for improved equipment safety, and superior cycling ability for reliable performance under demanding conditions. The fuse boasts an interrupting rating of 200kA AC and 100kA DC, with an LR (L/R) of 10ms. Applications include motor drives, UPS systems, and inverters operating at 700V or less. This fuse is UL recognized (File E60314) and CSA certified (File LR 12636), ensuring compliance with industry standards. The compact size also allows for potential down-sizing of existing equipment. SKU: A70QS50-4. Manufacturer: Mersen. Country of Origin: US.
  • 700VAC/VDC voltage rating
  • 50A current rating
  • Very low I²t for superior equipment protection
  • Longer life under cyclic loading
  • Low watts loss for cooler operation
  • 200kA IR AC / 100kA IR DC interrupting rating
  • UL recognized and CSA certified

Specifications

AC Voltage Rating
700 V
Amperage Rating
50 A
Application
Protection of 700V or less motor drives, UPS, inverters, etc.
Brand Name
Mersen
Case
GMG
Case Material
GMG
Connection
Blade
DC Voltage Rating
700 V
Mounting
Bolted
Mounting
Bolt
Size
4.38 x 1;111.252 x 25.4 in;mm
Size
4.38 x 1 in
Size
111.252 x 25.4 mm
Special Features
Very Low I2t for improved protection of equipment Superior cycling ability for long, reliable life on high cyclic loading Low watts loss for cooler operation 700V AC/DC rating gives greater design versatility Ultra compact sizes allow down-sizing of existing equipment
Standard
UL recognized component, AC/DC UL file E60314 AC: guide no. JFHR2 DC: tested to UL standard 198L parameters (35-800A) CSA certified File LR 12636
Sub Brand
Amp-Trap®
Type
Round Body High-Speed Fuse-Links AC Protection
Voltage Rating
700 V
Voltage Rating
700 V V
Package Dimensions (L x W x H)
4.38 in x 1 in x 1 in
Package Dimensions (L x W x H)
111.252 mm x 25.4 mm x 25.4 mm
Package Weight (Imperial)
0.510 lb
Package Weight (Metric)
0.231 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.