Mersen 64003R - Fuse Block 600VAC 600VDC Class R 400A 3-Pole Box Side-Clip
Mersen

64003R

Alternate Item Number: 64003R

UPC: 782001665050


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Overview

The Mersen 64003R is a 3-pole fuse block designed for Class R 600V fuses, rated for 400A and 600VAC/VDC. This model features box side-clip connectors, accommodating a wire range of 1000-250 kcmil for Al/Cu wire. Constructed with a durable phenolic insulator, it ensures reliable performance in demanding electrical applications. The fuse block meets UL 4248 requirements and holds UL listed (guide IZLT, File E52283) and CSA certified (class 6225, File 32169) status. Its high conductivity tin-plated copper fuse clips are spring reinforced for secure contact. This Mersen fuse block is compatible with Class R 600V fuses such as A6D-R, A6K-R, and TRS-R. The connector torque specification is 375 in-lbs. Manufactured in the USA, it provides a secure and dependable solution for overcurrent protection in industrial and commercial power distribution systems. The SCCR is 200kA with class R fuses. SKU: 64003R.
  • Mersen 64003R 3-Pole Class R Fuse Block
  • 600VAC/VDC Voltage Rating
  • 400A Ampere Rating
  • Box Side-Clip Connector Type
  • Phenolic Insulator Construction

Specifications

AC Voltage Rating
600 V
Amperage Rating
400 A
Brand Name
Mersen
Class
Class R
Connection
Box Side-Clip
Connection Type
Box side-clip
Current Rating
400A
DC Voltage Rating
600 V
Material
Phenolic, Tin-plated Copper
Material
Phenolic
Maximum Operating Temperature
80 C
Mounting
Direct Screw Mount
Number Of Poles
3-pole
Phase
3
Poles
3-pole
Series
Class R
Size
15 x 12.75 x 3.75 in
Size
381 x 323.85 x 95.25 mm
Size
1000-250 kcmil
Standard
All fuse blocks meet the requirements of UL 4248 UL listed, guide IZLT, File E52283 UL recognized component guide IZLT2, file E52283 CSA certified class 6225, File 32169
Type
UL/CSA Fuse Bases
Voltage Rating
600 VAC
Package Dimensions (L x W x H)
15 in x 12.75 in x 3.75 in
Package Dimensions (L x W x H)
381 mm x 323.85 mm x 95.25 mm
Package Weight (Imperial)
14.900 lb
Package Weight (Metric)
6.759 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.