Mersen A25X4000-128 - 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 4000 Amps A25X series.
Mersen

A25X4000-128

Alternate Item Number: 782001942960

UPC: 782001942960

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Overview

The **Mersen A25X4000-128 Amp-trap Semiconductor Protection Fuse** is a high-performance, ultra-high-current fuse designed to safeguard critical power semiconductor devices in demanding industrial applications. Engineered for the **A25X series**, this fuse delivers exceptional protection against overcurrent and short-circuit conditions, ensuring the reliability and longevity of diodes, phase control SCRs, and other high-power semiconductor components. With a **250V voltage rating** and a **4000A current rating**, the A25X4000-128 is optimized for high-power electrical systems where precision protection is non-negotiable. **Key Features and Benefits:** - **Superior Protection for Power Semiconductors:** The A25X4000-128 is specifically designed for power semiconductor devices, providing fast-acting interruption to prevent damage from fault conditions. Its high interrupting rating ensures it can safely handle extreme fault currents, making it ideal for applications where semiconductor failure could lead to costly downtime or equipment damage. - **High Current and Voltage Ratings:** Rated for **250V** and **4000A**, this fuse is built to perform in high-power industrial environments, including motor drives, power converters, and renewable energy systems. Its robust design ensures consistent performance even under harsh operating conditions. - **A25X Series Reliability:** Part of Mersen’s trusted **A25X series**, this fuse leverages decades of expertise in semiconductor protection. The series is renowned for its durability, precision, and adherence to stringent industry standards, making it a preferred choice for engineers and maintenance professionals. - **Wide Application Range:** The A25X4000-128 is suitable for a variety of high-power applications, including: - **Motor drives and variable frequency drives (VFDs)** - **Power converters and inverters** - **Renewable energy systems (solar, wind, and battery storage)** - **Industrial heating and welding equipment** - **Traction and transportation systems** - **Easy Installation and Maintenance:** Designed for compatibility with standard fuse holders and mounting systems, the A25X4000-128 simplifies installation and replacement. Its compact design and high-quality construction reduce maintenance requirements, ensuring long-term reliability with minimal downtime. **Why Choose Mersen for Semiconductor Protection?** Mersen is a global leader in electrical protection and power management solutions, with a reputation for innovation and quality. The company’s **Amp-trap series** of semiconductor protection fuses is trusted by industries worldwide for its exceptional performance in protecting sensitive power electronics. Professionals rely on Mersen fuses for their: - **Fast response times** to minimize semiconductor damage - **High interrupting ratings** to handle extreme fault currents - **Compliance with international standards** (e.g., UL, IEC) - **Durable construction** for harsh industrial environments **Industry Applications and Use Cases:** The A25X4000-128 is particularly well-suited for: - **Heavy industrial machinery** where high currents and voltages are common - **Power generation and distribution systems** requiring reliable fault protection - **Electric vehicle (EV) charging infrastructure** where semiconductor reliability is critical - **Data centers and critical infrastructure** where uptime is paramount **Selection and Installation Considerations:** When selecting a semiconductor protection fuse, professionals consider factors such as: - **Voltage and current ratings** to match system requirements - **Interrupting rating** to ensure the fuse can safely interrupt fault currents - **Response time** to protect sensitive components from damage - **Compatibility** with existing fuse holders and mounting systems The **Mersen A25X4000-128** excels in all these areas, making it an ideal choice for engineers and maintenance teams seeking a reliable, high-performance solution for semiconductor protection. Whether you’re designing a new system or upgrading an existing one, this fuse delivers the performance and peace of mind you need to protect your most critical power electronics.
  • 250V voltage rating for high-power applications
  • 4000A current rating for extreme fault protection
  • Designed for diodes, SCRs, and other power semiconductors
  • Part of Mersen’s trusted A25X series
  • Fast-acting interruption to prevent semiconductor damage

Specifications

Amperage Rating
4000 A
Application
Protection of AC/DC drives, UPS and other equipment of 300 volts or less
Brand Name
Ferraz Shawmut
Current Rating
4000 A
Series
A25X
Special Features
250VAC rated Low I 2 t minimizes damage to protected component on short circuit. Controlled arc Voltage reduces stress to circuit components during fuse clearing. Choice of mounting types helps in equipment design
Standard
UL Recognized Component Guide JFHR2 Some Ratings RoHS Compliant
Type
North American Round Style
Voltage Rating
250 VAC
Package Dimensions (L x W x H)
2.59 IN x 4.5 IN x 4.5 IN
Package Dimensions (L x W x H)
6.5786 cm x 11.43 cm x 11.43 cm
Package Weight (Imperial)
7.200 L
Package Weight (Metric)
3.266 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.