Mersen 64063J - Fuse Block 600VAC 600VDC Class J 400A 3-Pole Copper Box In-Line Clip
Mersen

64063J

Alternate Item Number: 64063J

UPC: 782001751999


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Overview

The Mersen 64063J is a high-performance Class J fuse block designed for 400A applications at 600VAC/DC. This 3-pole fuse block features a copper box in-line clip configuration, ensuring reliable electrical connectivity for stranded or solid copper conductors. The insulator is molded phenolic with dielectric strength exceeding 2500V, providing robust insulation and safety compliance. Engineered for compatibility with Class J fuses (AJT, A4J, HSJ), this fuse block meets UL4248 (formerly UL512) and CSA Class 6225 standards, with a Short Circuit Current Rating (SCCR) of 200kA. The tin-plated copper fuse clips deliver high conductivity, while the spring-reinforced design enhances contact stability. Suitable for industrial and commercial applications, the 64063J supports conductor sizes from 350kcmil to #6, with a torque rating of 275 in-lb. Certified by UL and CSA, this fuse block is ideal for power distribution systems requiring reliable overcurrent protection and high dielectric performance.
  • Rated for 400A at 600VAC/DC with 200kA SCCR
  • Copper box in-line clip for stranded/solid copper conductors (350kcmil-#6)
  • Phenolic insulator with dielectric strength >2500V
  • UL4248 and CSA Class 6225 certified for Class J fuses (AJT, A4J, HSJ)
  • Spring-reinforced tin-plated copper clips for high conductivity and stability

Specifications

AC Voltage Rating
600 V
Amperage Rating
400 A
Brand Name
Mersen
Class
Class J
Connection
Box In-Line Clip
DC Voltage Rating
600 V
Material
Phenolic
Maximum Operating Temperature
80 C
Mounting
Direct Screw Mount
Number Of Poles
3-pole
Phase
3
Size
10 x 10.5 x 3.62 in
Size
254 x 266.7 x 91.948 mm
Special Features
Class J Blocks (600V) use with AJT, A4J, HSJ
Standard
All class J fuse blocks meet the requirements of UL4248 (formerly UL512) UL listed Guide IZLT, File E52283 CSA certified class 6225, File 32169
Type
UL/CSA Fuse Bases
Voltage Rating
600 VAC
Package Dimensions (L x W x H)
10 in x 10.5 in x 3.62 in
Package Dimensions (L x W x H)
254 mm x 266.7 mm x 91.948 mm
Package Weight (Imperial)
16.450 lb
Package Weight (Metric)
7.462 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.