Mersen 66051T - Fuse Block 600VAC 600VDC Class T 600A 1-Pole Copper Box
Mersen

66051T

Alternate Item Number: 66051T

UPC: 782001675950


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Overview

The Mersen 66051T is a single-pole Class T fuse block designed for 600VAC/VDC applications, rated for up to 600 Amperes. This block features durable phenolic insulation with a verified dielectric strength exceeding 2500V, ensuring robust safety and reliability in demanding electrical systems. A key differentiator for Mersen is the inclusion of copper box connectors, a feature unique to their Class T offerings. These copper connectors are specifically designed with the same coefficient of expansion as copper wire, promoting improved heat cycling performance and meeting or exceeding OEM "no aluminum" specifications. This makes the 66051T ideal for applications where copper conductors are mandatory. The block is built to accommodate Class T fuses up to 600A and is UL listed (guide IZLT, File E52283), CSA certified (class 6225, File 32169), and meets UL 4248 requirements. Its construction ensures cool running at high amperages, making it suitable for heavy-duty industrial power distribution and protection circuits. The SKU 66051T is manufactured in the USA and is a critical component for ensuring the safety and operational integrity of electrical equipment. For 400A and 600A blocks, recommended base mounting screws are 1/4" (.250" dia.). The connector torque for this 600A box connector is 375 in-lbs, and it is designed for copper wire ranges of (2) 600 kcmil-#2.
  • 600VAC/VDC, 600A rating for high-power applications
  • Unique copper box connectors for superior heat cycling and OEM compliance
  • Durable phenolic insulator with dielectric strength over 2500V
  • Accommodates Class T fuses up to 600A
  • UL listed, CSA certified, and meets UL 4248 standards

Specifications

AC Voltage Rating
600 V
Amperage Rating
600 A
Brand Name
Mersen
Class
Class T
Connection
Box
Connection Type
Copper Box
Current Rating
600A
DC Voltage Rating
600 V
Family Code
147
Family Description
Fuse Blocks & Acc
Material
Phenolic
Material
Copper, Glass-filled Polycarbonate (GFPC) or Phenolic
Maximum Operating Temperature
80 C
Mounting
Direct Screw Mount
Number Of Poles
1
Phase
1
Poles
1-pole
Size
6.5 x 3 x 3.09 in
Size
165.1 x 76.2 x 78.486 mm
Special Features
Unique integral DIN-rail adapters for 600V, 30 & 60A blocks Full barrier design (30 & 60A) increases pole to pole safety Unique adder-block design (30 & 60A) for design flexibility Spring reinforcing standard for all 30 & 60A clips Features high conductivity copper alloy fuse clips Cool running high amperage (100 - 600A) connectors Copper connectors available 30 - 600A
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)
6.5 in x 3 in x 3.09 in
Package Dimensions (L x W x H)
165.1 mm x 76.2 mm x 78.486 mm
Package Weight (Imperial)
2.150 lb
Package Weight (Metric)
0.975 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.