Mersen A70QS12-14F - 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 12 amps.
Mersen

A70QS12-14F

Alternate Item Number: 782001141998

UPC: 782001141998

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Overview

The Mersen A70QS12-14F represents a significant advancement in semiconductor protection, extending the highly regarded A70QS product line with premium French cylindrical semiconductor fuses. Engineered for demanding industrial applications, this specific model, SKU A70QS12-14F, is rated at 12 amps and 690VAC, making it an ideal choice for safeguarding critical components in modern power electronics. At its core, the A70QS12-14F is a solid-fill fuse, a construction method that enhances its durability and performance under extreme conditions. It boasts impressive IEC ratings, including an interrupting capacity of 200kA at 690VAC, ensuring it can safely clear severe fault currents and protect sensitive equipment from catastrophic damage. Furthermore, its DC performance is equally robust, with a 700VDC rating and an interrupting capacity of 100kA at a 10ms time constant. This dual AC/DC capability makes it exceptionally versatile for a wide range of power conversion and control systems. A standout feature of the A70QS12-14F is its specialized 890 VDC rating, specifically designed for capacitor discharge applications. This rating allows for reliable protection in systems where capacitors are rapidly discharged, with a time constant of up to 2.5ms. This capability is crucial for applications such as high-power pulsed systems, specialized welding equipment, and advanced motor drives that rely on precise capacitor bank management. Engineered for superior performance, these fuses offer enhanced I²t characteristics. The I²t value represents the energy a fuse can withstand before melting, and a lower I²t rating indicates faster and more precise protection. This superior I²t performance in the A70QS12-14F translates directly to improved protection for semiconductor devices like IGBTs and MOSFETs, minimizing the risk of thermal runaway and extending the operational lifespan of expensive power modules. This enhanced protection is paramount in applications such as: * **Small Inverter Drives:** Protecting the power electronics within variable frequency drives (VFDs) that control motor speed and torque. * **UPS Systems:** Ensuring the reliability and safety of uninterruptible power supplies, critical for data centers, hospitals, and industrial automation. * **Capacitor Discharge Applications:** Providing essential overcurrent protection in systems requiring rapid energy release from capacitor banks. Available with a striker option, the Mersen A70QS12-14F facilitates easy integration into fuse holders equipped with blown-fuse indication systems. This feature simplifies troubleshooting and maintenance, allowing for quick identification of a tripped fuse and minimizing downtime. The 14mm diameter and 22mm length of this French cylindrical fuse conform to industry standards, ensuring compatibility with a wide array of existing equipment and fuse holders. Mersen's reputation for quality and innovation in electrical protection is well-established. The A70QS series, and this premium extension, embodies their commitment to providing robust, reliable, and high-performance solutions for the most challenging industrial environments. When selecting semiconductor fuses, professionals prioritize factors like interrupting rating, voltage rating, I²t characteristics, and manufacturer reliability. The Mersen A70QS12-14F excels in all these areas, offering peace of mind and superior operational integrity for critical power systems.
  • Mersen A70QS12-14F Premium French Cylindrical Semiconductor Fuse
  • 12 Ampere Rating, 690VAC IEC Rated with 200kA Interrupting Capacity
  • 700VDC Rated with 100kA Interrupting Capacity (10ms time constant)
  • Specialized 890VDC Rating for Capacitor Discharge (up to 2.5ms time constant)
  • Superior I²t for enhanced semiconductor protection; available with striker

Specifications

Amperage Rating
12 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
12 A
Material
Solid-fill
Mounting
Clip
Series
A70QS
Size
14mm
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
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
Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount

GPM-SRR90

Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount
Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20

C331156

Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20
Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8

1SCM8

Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8
Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

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