Mersen W233561 - DIN NH Standard fuse-link aM Size NH4a 500VAC 1250A live tags Top indicator Body width 100.10 mm
Mersen

W233561

Alternate Item Number: NH4AAM50V1250-8


Documents & Media
Specification Sheet

Contact for Pricing

Overview

The Mersen W233561 is a DIN NH Standard fuse-link, specifically an aM type, designed for motor circuit protection. Rated for 500VAC and 1250A, this NH4a size fuse-link features live tags and a top indicator for clear status visibility. Its body width measures 100.10 mm. Type 'aM' NH fuse-links are partial-range breaking capacity devices, characterized by their strong current-limiting capabilities and low power losses. They are engineered to interrupt currents from 6.3 times the nominal current up to their maximum breaking capacity, making them ideal for short-circuit protection. Crucially, these fuse-links must be paired with other switchgear for comprehensive overload protection. The NH system, a plug-in fuse system, comprises a fuse-base, fuse-link with blade contact, and a fuse-link replacement device. Due to the system's design, which does not guarantee non-interchangeability of rated current, handling by a qualified professional is mandatory. This Mersen fuse-link offers reliable protection for motor circuits where precise short-circuit interruption is paramount.
  • Mersen NH4a size fuse-link
  • Rated 500VAC, 1250A
  • aM type for motor circuit protection
  • Features live tags and top indicator
  • Body width: 100.10 mm

Specifications

AC Voltage Rating
500 V
Amperage Rating
1250 A
Application
aM: Partial purpose, motor circuit protection
Body Material
Ceramic
Brand Name
Mersen
Connection
Plain Blades
Connection Material
Silver-Plated Copper
Connection Type
live tags
Current Rating
1250A
Interrupt Rating
120 kA
Mounting
Clip
Mounting Type
Plug-in
Series
NH
Size
7.87 x 3.94 x 48.62 in
Size
200 x 100 x 1235 mm
Size
NH4a
Special Features
Dimensions according to DIN 43 620 parts 1 to 4 Non-isolated gripping lugs Double indicator 0 cadmium
Standard
VDE 0636 Part 201 IEC 60269-1 and -2
Type
IEC NH Fuse-Links
Type Of Indicators
Top indicator
Voltage Rating
500VAC
Package Dimensions (L x W x H)
7.87 in x 3.94 in x 48.62 in
Package Dimensions (L x W x H)
200 mm x 100 mm x 1235 mm
Package Weight (Imperial)
4.850 lb
Package Weight (Metric)
2.200 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.

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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.