Mersen A70QS25-14F - 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 25 amps 14x51 ferrule.
Mersen

A70QS25-14F

Alternate Item Number: 782001142025

UPC: 782001142025

Contact for Pricing

Overview

The Mersen A70QS25-14F Premium Amp-trap French Cylindrical Semiconductor Fuse represents a significant advancement in overcurrent protection for demanding industrial environments. As an extension of the highly regarded A70QS product line, this fuse is engineered to deliver exceptional performance and reliability, particularly in applications involving sensitive semiconductor devices. Its solid-fill construction, a hallmark of Mersen's commitment to quality, ensures robust performance under extreme conditions. Designed to meet stringent international standards, the A70QS25-14F boasts an IEC rating of 690VAC with an impressive 200kA interrupting capacity. For DC applications, it is rated at 700VDC, capable of interrupting 100kA with a 10ms time constant. Furthermore, this versatile fuse is specifically qualified for capacitor discharge applications, offering an 890 VDC rating with a rapid 2.5ms time constant. This capability is crucial for protecting power electronics systems that utilize capacitor banks for energy storage and discharge. Key applications for the Mersen A70QS25-14F include small inverter drives and Uninterruptible Power Supply (UPS) systems. In these critical systems, the fuse's superior I²t characteristics are paramount. The I²t value represents the energy a fuse can withstand before blowing, and a lower I²t rating indicates faster and more precise protection against damaging current surges. This enhanced protection safeguards expensive semiconductor components, minimizing downtime and maintenance costs. The availability of a striker option further enhances safety and operational efficiency by providing a clear visual indication of fuse operation and enabling automated fault detection systems. With its 14x51mm ferrule dimensions and 25-ampere rating, the A70QS25-14F is a direct-fit solution for many existing installations, simplifying upgrades and replacements. Mersen's legacy of innovation and quality in fuse technology makes the A70QS series, including the A70QS25-14F, a trusted choice for engineers and maintenance professionals seeking the highest level of protection for their critical electrical infrastructure. Its precision engineering ensures that your systems are protected against both short circuits and transient overcurrents, contributing to overall system longevity and operational integrity. Choosing Mersen means investing in proven reliability and advanced protection technology.
  • Premium Amp-trap French Cylindrical Semiconductor Fuse
  • 25A, 690VAC (200kA IC) / 700VDC (100kA IC @ 10ms)
  • 890VDC rating for capacitor discharge (2.5ms TC)
  • 14x51mm ferrule dimensions
  • Superior I²t for enhanced semiconductor protection

Specifications

Amperage Rating
25 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
25A
Material
Semiconductor
Material
Solid-fill
Mounting
Clip
Series
A70QS
Size
14X51MM
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
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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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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.