Mersen A25Z125-4 - 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 125 Amps A25Z series.
Mersen

A25Z125-4

Alternate Item Number: 782001942670

UPC: 782001942670

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Overview

The Mersen A25Z125-4 Amp-trap Semiconductor Protection Fuse (SKU: A25Z125-4) is a critical component engineered for the robust protection of sensitive power semiconductor devices. Designed by Mersen, a recognized leader in electrical protection solutions, this fuse offers unparalleled reliability for applications demanding precise and rapid fault current interruption. Its primary function is to safeguard high-power semiconductor components such as diodes, phase control SCRs (Silicon Controlled Rectifiers), and other power electronic devices from damaging overcurrents and short circuits. With a substantial voltage rating of 250 Volts and a current rating of 125 Amps, the A25Z125-4 fuse is ideally suited for a wide array of industrial power systems. These systems often involve significant power conversion, motor control, and power supply units where the integrity of semiconductor devices is paramount to operational continuity and safety. The A25Z series is specifically developed to meet the stringent requirements of semiconductor protection, offering a low I²t value which signifies its ability to absorb and dissipate energy during a fault, thereby minimizing stress on the protected components. Key benefits of employing the Mersen A25Z125-4 fuse include: * **Superior Semiconductor Protection:** Effectively shields diodes, SCRs, and other power semiconductors from destructive electrical events. * **Fast Acting Response:** Provides rapid interruption of fault currents, significantly reducing the duration of overcurrent conditions and preventing catastrophic failure. * **High Reliability:** Manufactured to exacting standards by Mersen, ensuring consistent performance and long service life in demanding industrial environments. * **Optimized for Power Electronics:** Specifically designed to handle the unique protection needs of power semiconductor devices, which often have fast transient characteristics. * **Reduced Downtime and Costs:** By preventing damage to expensive semiconductor components, this fuse helps minimize unexpected equipment failures, costly repairs, and production downtime. Industrial applications where the Mersen A25Z125-4 Amp-trap fuse excels include variable speed drives, uninterruptible power supplies (UPS), DC power supplies, welding equipment, and renewable energy systems. The selection of an appropriate semiconductor protection fuse is a crucial step in the design and maintenance of any power electronic system. Factors such as the rated voltage, rated current, breaking capacity, and the specific characteristics of the semiconductor device being protected must be carefully considered. Mersen's A25Z series, including the A25Z125-4, is engineered to provide the necessary protection margins for these critical applications. Trust in Mersen's extensive experience and commitment to quality to ensure the longevity and operational efficiency of your valuable power semiconductor assets.
  • Mersen A25Z125-4 Amp-trap Semiconductor Protection Fuse
  • 250 Volts AC/DC voltage rating
  • 125 Amps current rating
  • Designed for protection of power semiconductor devices (diodes, SCRs)
  • Fast-acting for critical overcurrent and short-circuit interruption

Specifications

Amperage Rating
125 A
Application
Protection of AC/DC drives, UPS and other equipment of 300 volts or less
Brand Name
Ferraz Shawmut
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)
3.13 IN x 1.22 IN x 1.22 IN
Package Dimensions (L x W x H)
7.9502 cm x 3.0988 cm x 3.0988 cm
Package Weight (Imperial)
0.380 L
Package Weight (Metric)
0.172 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.
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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.