Mersen A70QS20-22FI - 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 20 amps 22x58 ferrule w/striker.
Mersen

A70QS20-22FI

Alternate Item Number: 782001142223

UPC: 782001142223

Contact for Pricing

Overview

Introducing the Mersen A70QS20-22FI Premium Amp-trap French Cylindrical Semiconductor Fuse, a high-performance protection solution engineered for demanding industrial applications. Part of Mersen’s renowned A70QS series, this 22x58mm fuse delivers exceptional reliability and precision in critical power systems. Designed with a solid-fill construction, the A70QS20-22FI combines robust electrical ratings with advanced thermal management, ensuring optimal performance in both AC and DC environments. The A70QS20-22FI is rated for 690VAC with an interrupting capacity of 200kA at 10ms, making it ideal for high-energy industrial systems. For DC applications, it offers 700VDC with a 100kA interrupting rating at 10ms, while also supporting an 890VDC rating for capacitor discharge applications up to 2.5ms. This versatility allows the fuse to safeguard sensitive electronics in inverter drives, uninterruptible power supplies (UPS), and other high-power conversion systems. The inclusion of a striker enhances operational safety by providing visual or remote indication of fuse operation, enabling proactive maintenance and system diagnostics. Semiconductor fuses like the A70QS20-22FI are essential in applications where rapid fault clearing and minimal downtime are critical. The superior I²t performance of this fuse ensures precise fault interruption, reducing stress on downstream components and extending equipment lifespan. Its compact 22x58mm ferrule design facilitates easy installation in tight enclosures, while the solid-fill construction enhances thermal stability and resistance to environmental contaminants. Mersen, a global leader in electrical protection and thermal management solutions, has designed the A70QS20-22FI to meet the rigorous demands of industries such as renewable energy, industrial automation, and data centers. The fuse’s compliance with IEC standards and its reputation for durability make it a trusted choice among engineers and system integrators. Whether protecting inverters in solar power systems, safeguarding UPS units in critical infrastructure, or ensuring reliability in motor drives, the A70QS20-22FI delivers uncompromising performance. Professionals selecting fuses for semiconductor applications must consider interrupting ratings, response time, and thermal characteristics. The A70QS20-22FI excels in all these areas, offering a balance of high interrupting capacity, fast response, and robust construction. Its striker feature further enhances system monitoring, allowing for immediate identification of faults and minimizing operational disruptions. For applications requiring reliable, high-speed protection in high-voltage environments, the Mersen A70QS20-22FI stands as a benchmark in semiconductor fuse technology.
  • 690VAC rated with 200kA interrupting capacity at 10ms
  • 700VDC rated with 100kA interrupting capacity at 10ms
  • 890VDC rating for capacitor discharge applications up to 2.5ms
  • 22x58mm solid-fill ferrule design with striker for enhanced safety
  • Superior I²t performance for improved protection and system reliability

Specifications

Amperage Rating
20 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
20 A
Material
Solid-fill
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
Type Of Indicators
Striker
Voltage Rating
690 VAC
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.

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

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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.