Mersen ALS400 - Forklift Truck ALS 125VAC 125VDC 400A Fast-Acting Blade
Mersen

ALS400

Alternate Item Number: ALS400

UPC: 068938791681


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Overview

The Mersen ALS400 is a fast-acting blade fuse engineered for the demanding electrical protection needs of DC battery-powered industrial equipment. Specifically designed for applications such as forklift trucks, battery hand trucks, and motorized work platforms, this fuse ensures reliable circuit protection in heavy-duty environments. With a robust construction and a stud-mounted bolt-in design, the ALS400 offers extended service life even under adverse operating conditions. It is rated for 125V AC/DC and has an interrupting rating (IR) of 10kA AC/DC, providing essential safety for your critical systems. This fuse is part of Mersen's expanded line of Forklift Truck Fuses, designed to meet a wide range of heavy-duty circuit protection requirements. The ALS series, including the ALS400, is characterized by its general-purpose type functionality, higher voltage and ampere ratings, and superior interrupting capabilities compared to some other series. Its compatibility with Mersen's P243E fuse blocks further simplifies integration into existing systems. Trust Mersen's expertise in circuit protection for your industrial fleet. SKU: ALS400. Country of Origin: US.
  • Fast-acting blade fuse for industrial DC battery equipment
  • Rated for 125V AC/DC with a 10kA interrupting rating
  • Rugged construction for long life in adverse conditions
  • Stud-mounted bolt-in design for secure installation
  • Ideal for forklift trucks, hand trucks, and work platforms

Specifications

AC Voltage Rating
125 V
Amperage Rating
400 A
Application
Forklift trucks Battery hand trucks Motorized work platforms Battery systems
Body Material
PolyTube
Brand Name
Mersen
Connection
Blade
Connection Material
Copper
DC Voltage Rating
125 V
Interrupt Rating
10 kA
Mounting
Bolted
Size
4.71 x 1.12 in
Size
119.634 x 28.448 mm
Special Features
All fuses are AC and DC rated Expanded ampere ratings Time-delay and general purpose types
Standard
UL recognized components (All Products) File E60314
Type
Forklift Truck Fuses
Voltage Rating
125 VAC
Package Dimensions (L x W x H)
4.71 in x 1.12 in x 1.12 in
Package Dimensions (L x W x H)
119.634 mm x 28.448 mm x 28.448 mm
Package Weight (Imperial)
0.260 lb
Package Weight (Metric)
0.118 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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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.