Mersen A70QS50-22F - These Premium Amp-trap French Cylindrical Semiconductor Fuses are an extension of the popular A70QS product line. They are solid-fill 14mm and 22mm fuses IEC rated 690VAC, 200kA Interrupting and 700VDC, 100kA interrupting at 10ms time constant. In addition, these fuses have an 890 VDC rating for capacitor discharge applications up to 2.5ms time constant. All ampere ratings are available with a striker. Applications include small inverter drives and UPS systems, with superior I²t for improved protection and performance. 690 Volts 50 amps 22x58 ferrule.
Mersen

A70QS50-22F

Alternate Item Number: 782001142100

UPC: 782001142100

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Overview

The Mersen A70QS50-22F is a premium French cylindrical semiconductor fuse, extending the established A70QS product line. This solid-fill fuse features a 22x58mm ferrule mount and is IEC rated for 690VAC with a 200kA interrupting rating. For DC applications, it is rated at 700VDC with a 100kA interrupting capability at a 10ms time constant. Furthermore, the A70QS50-22F is designed for capacitor discharge applications, offering an 890VDC rating with a 2.5ms time constant. Its superior I²t performance enhances protection and system longevity, making it ideal for small inverter drives and UPS systems. The fuse is built to international standards, with 22x58mm dimensions for worldwide acceptance. It offers very low I²t for improved semiconductor protection and aR characteristic for semiconductor short-circuit protection. The A70QS series is UL recognized (File E76491), CSA Certified, and IEC 269-4 compliant. This specific model, A70QS50-22F, is rated for 50 amps and is available with an optional striker for visual or remote indication. It is designed for DC protection of equipment with L/R ≤10ms and exhibits superior cycling ability for extended life in demanding cyclic loading applications. All ampere ratings in this series are available with a striker. Manufacturer SKU: A70QS50-22F. UNSPSC Code: 39121628. Country of Origin: US.
  • IEC rated 690VAC, 200kA interrupting
  • 700VDC rated, 100kA interrupting at 10ms
  • 890VDC for capacitor discharge (2.5ms)
  • 22x58mm ferrule mount size
  • Superior I²t for enhanced semiconductor protection

Specifications

Amperage Rating
50 A
Application
Small inverters, UPS systems, Solid State Relays, motor drives and similar 700V or less equipment
Brand Name
Ferraz Shawmut
Connection
Ferrule
Connection Type
Ferrule
Current Rating
50 A
Material
Solid-fill
Material
Semiconductor Fuse
Mounting
Clip
Series
A70QS
Size
22x58 mm
Special Features
International 14 x 51mm (2 In x 9/16 In) and 22 x 58mm (2-1/4 In x 13/16 In) sizes for worldwide acceptance Ferrule mount for design versatility Very low I2t for improved semiconductor protection 690V IEC rated, tested at 760VAC, can be used up to 750VAC in U.S. 700VDC rated for dc protection of equipment with L/R <= 10ms/c Superior cycling ability for longer life on difficult cyclic loading applications
Standard
UL Recognized Component CSA Certified IEC 269-4 Compliance
Type
North American Round Style
Voltage Rating
690 VAC
Voltage Rating
690 VAC / 700 VDC / 890 VDC
Package Dimensions (L x W x H)
2.28 IN x 0.86 IN x 0.86 IN
Package Dimensions (L x W x H)
5.7912 cm x 21.844 mm x 21.844 mm
Package Weight (Imperial)
0.100 L
Package Weight (Metric)
0.045 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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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.