Mersen 6661J - Fuse Block 600VAC 600VDC Class J 600A 1-Pole Copper Box In-Line Clip
Mersen

6661J

Alternate Item Number: 6661J

UPC: 782001751968


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Overview

The Mersen 6661J is a 1-pole Class J fuse block designed for 600A applications, rated for 600VAC/DC. This model features copper box in-line clips, ensuring high conductivity and reliable connections for copper conductors. The phenolic insulator provides verified dielectric strength exceeding 2500V, meeting stringent safety standards. Designed to accommodate all Class J fuses, including AJT, A4J, and HSJ series, this fuse block offers a robust solution for overcurrent protection. It boasts a Short Circuit Current Rating (SCCR) of 200kA, providing significant protection against fault currents. The in-line clip design facilitates straightforward wiring, and the block is built with high conductivity tin-plated copper fuse clips for optimal performance. This Mersen fuse block meets the requirements of UL4248 (formerly UL512), is UL listed (Guide IZLT, File E52283), and CSA certified (class 6225, File 32169). Its construction prioritizes durability and electrical integrity for industrial environments. The 6661J is specifically engineered for copper wires, featuring copper box connectors and clips that match the coefficient of expansion of copper wire for improved heat cycling and to meet or exceed OEM "no aluminum" specifications. The recommended mounting screw size for this 600A fuse block is 5/16" (.313" dia.).
  • Mersen 6661J 1-Pole Class J Fuse Block
  • 600A, 600VAC/DC Rating
  • Copper Box In-Line Clip Connectors
  • Phenolic Insulator with 2500V+ Dielectric Strength
  • 200kA SCCR, UL & CSA Certified

Specifications

AC Voltage Rating
600 V
Amperage Rating
600 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
1
Phase
1
Size
11 x 4 x 4.74 in
Size
279.4 x 101.6 x 120.396 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)
11 in x 4 in x 4.74 in
Package Dimensions (L x W x H)
279.4 mm x 101.6 mm x 120.396 mm
Package Weight (Imperial)
8.760 lb
Package Weight (Metric)
3.973 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.