Mersen A25Z300-4 - A25Z 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 300 Amps  A25Z series.
Mersen

A25Z300-4

Alternate Item Number: 782001942373

UPC: 782001942373

Contact for Pricing

Overview

The Mersen A25Z300-4 Amp-trap Semiconductor Protection Fuse (SKU: A25Z300-4) is engineered for the critical protection of power semiconductor devices. This fuse is specifically designed to safeguard diodes, phase control SCRs, and other sensitive power electronic components from damaging overcurrent and short-circuit events. Rated for 250 Volts and 300 Amps, the A25Z300-4 provides essential protection in industrial power systems where semiconductor reliability is paramount. Power semiconductors are vital for energy conversion and control in modern industrial applications. However, their sensitivity to transient overcurrents necessitates robust protection. The A25Z300-4 offers fast-acting, current-limiting protection, minimizing fault energy and preventing catastrophic failures. Its rapid response time shields protected components, extending their operational lifespan and maintaining system integrity. Key Features: - **Precision Semiconductor Protection:** Specifically designed for diodes and SCRs. - **Voltage and Current Rating:** 250V AC/DC, 300A. - **Fast-Acting Response:** Minimizes stress on protected components during faults. - **High Interrupting Capacity:** Safely interrupts fault currents. Typical Applications: - Motor Drives and VFDs - Power Conversion Systems (Rectifiers, Inverters) - Industrial Automation - Traction and Transportation Systems - Heavy Industrial Equipment Mersen is a trusted leader in electrical protection, offering a comprehensive portfolio of semiconductor protection fuses. The A25Z series is built for industrial-grade reliability and performance. When selecting a fuse, consider interruption rating, response time, and voltage/current compatibility. The A25Z300-4 meets these requirements for many demanding applications. Installation and Maintenance: Install the A25Z300-4 in a compatible fuse holder or disconnect switch. Ensure proper electrical clearance and mechanical stability. Tighten connections to specified torque. Regularly inspect for wear or damage and replace blown fuses with identical models. Choosing the Mersen A25Z300-4 ensures reliable, precise protection for your critical power semiconductor applications.
  • Designed for protection of Power Semiconductors (Diodes, SCRs)
  • 250 Volts AC/DC
  • 300 Amps
  • Fast-acting, current-limiting protection
  • Industrial-grade reliability

Specifications

Amperage Rating
300 A
Application
Protection of AC/DC drives, UPS and other equipment of 300 volts or less
Brand Name
Ferraz Shawmut
Current Rating
300 A
Series
A25Z
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
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)
0.650 L
Package Weight (Metric)
0.295 kg
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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.