Mersen A25X800-4 - A25X Amp-trap Semiconductor Protection fuses are intended for the protection of Power Semiconductors such as Diodes, Phase Control SCR's and other power Semiconductor devices 250 Volts 800 Amps A25X (type 4) series.
Mersen

A25X800-4

Alternate Item Number: 782001942830

UPC: 782001942830

Contact for Pricing

Overview

The Mersen A25X800-4 Amp-trap Semiconductor Protection Fuse (SKU: A25X800-4) is a high-performance fuse engineered specifically for the protection of sensitive power semiconductor devices such as diodes, phase control SCRs, and other advanced power semiconductors. Designed by Mersen, a leader in electrical protection solutions, this fuse delivers rapid and reliable interruption of fault currents to prevent catastrophic damage to costly electronic components. With a current rating of 800 Amps and a voltage rating of 250 Volts, the A25X800-4 is optimized for heavy-duty industrial applications where high power densities and stringent protection requirements are critical. The Type 4 NEMA rating ensures compliance with rigorous industry standards for semiconductor protection, offering low I²t values that minimize thermal stress on protected semiconductors during fault events. This series is renowned for its ability to absorb significant energy during short circuits while providing swift disconnection, a hallmark of Mersen’s Amp-trap technology. Key features include superior semiconductor protection, high current and voltage ratings, adherence to Type 4 NEMA standards, low I²t characteristics for reduced thermal stress, fast-acting response for rapid fault interruption, and durable construction for longevity in demanding environments. The A25X800-4 is ideal for applications in industrial motor drives, power supplies, inverters, rectifiers, and renewable energy systems, where the integrity of power semiconductors directly impacts operational uptime and system efficiency. Mersen’s commitment to quality and innovation ensures that the A25X800-4 fuse provides dependable protection for engineers and maintenance professionals. Choose Mersen for a legacy of electrical safety and performance, ensuring the longevity and reliability of your critical power semiconductor assets.
  • 800A current rating and 250V voltage rating for heavy-duty industrial applications
  • Type 4 NEMA-rated for compliance with semiconductor protection standards
  • Low I²t values minimize thermal stress on protected semiconductors during faults
  • Fast-acting response ensures rapid interruption of fault currents
  • Durable construction designed for longevity in demanding environments

Specifications

Brand Name
Ferraz Shawmut
Current Rating
800 A
Nema Rating
Type 4
Series
A25X
Voltage Rating
250 V
Package Dimensions (L x W x H)
3.84 IN x 1.5 IN x 1.5 IN
Package Dimensions (L x W x H)
9.7536 cm x 3.81 cm x 3.81 cm
Package Weight (Imperial)
0.700 L
Package Weight (Metric)
0.318 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.