Mersen A70QS20-14FI - 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 14x51 ferrule w/striker.
Mersen

A70QS20-14FI

Alternate Item Number: 782001142179

UPC: 782001142179

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Overview

The Mersen A70QS20-14FI Premium Amp-trap French Cylindrical Semiconductor Fuse represents a significant advancement in overcurrent protection for critical industrial power systems. As an extension of the highly regarded A70QS product line, this fuse is engineered to deliver exceptional performance and reliability in demanding applications. Its solid-fill construction ensures robust durability and consistent operation under challenging conditions. Designed to meet stringent international standards, the A70QS20-14FI boasts an IEC rating of 690VAC with an impressive 200kA interrupting capacity. For DC applications, it provides 700VDC protection with a 100kA interrupting rating at a 10ms time constant, making it suitable for a wide range of power electronics. Furthermore, this fuse is specifically rated for capacitor discharge applications, offering an 890 VDC rating with a rapid 2.5ms time constant, crucial for protecting sensitive capacitor banks. Key features and benefits of the Mersen A70QS20-14FI include: * **Superior Protection:** Engineered with a focus on enhanced I²t values, this fuse offers superior protection against damaging short circuits, safeguarding valuable equipment and minimizing downtime. * **Versatile Applications:** Ideal for use in small inverter drives, uninterruptible power supply (UPS) systems, and capacitor discharge circuits, where precise and rapid protection is paramount. * **Robust Construction:** The solid-fill design contributes to the fuse's durability and longevity, ensuring reliable performance even in harsh industrial environments. * **High Interrupting Ratings:** With 200kA at 690VAC and 100kA at 700VDC, it can safely interrupt severe fault currents. * **Striker Feature:** The inclusion of a striker mechanism facilitates easy detection of blown fuses and integration with fuse monitoring systems, streamlining maintenance and troubleshooting processes. The 14x51mm ferrule dimensions, combined with a 20A current rating, make this fuse a precise fit for many standard industrial fuse holders. Mersen's commitment to quality and innovation is evident in the A70QS series, providing engineers and maintenance professionals with trusted solutions for safeguarding their power infrastructure. Selecting the right semiconductor fuse is critical for system integrity, and the A70QS20-14FI delivers the performance and reliability required for modern industrial power electronics.
  • Mersen Premium Amp-trap French Cylindrical Semiconductor Fuse
  • 690VAC, 20A, 14x51mm Ferrule with Striker (SKU: A70QS20-14FI)
  • IEC Rated: 690VAC, 200kA Interrupting; 700VDC, 100kA Interrupting (10ms)
  • Capacitor Discharge Rating: 890VDC up to 2.5ms time constant
  • Superior I²t for enhanced protection in inverter drives and UPS systems

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
Mounting
Clip
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 IN x 0.55 IN x 0.55 IN
Package Dimensions (L x W x H)
5.08 cm x 13.97 mm x 13.97 mm
Package Weight (Imperial)
0.050 L
Package Weight (Metric)
0.023 kg
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Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20

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Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

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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

9F61BWW460

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.