Mersen 34051T - Fuse Block 300VAC 300VDC Class T 400A 1-Pole Copper Box
Mersen

34051T

Alternate Item Number: 34051T

UPC: 782001675783


Documents & Media
Line Drawing

Contact for Pricing

Overview

The Mersen 34051T is a 1-pole Class T fuse block designed for high-amperage applications, rated for 300 VAC and 300 VDC at 400 Amps. This fuse block features durable glass-filled polycarbonate (GFPC) or phenolic insulation with a dielectric strength exceeding 2500V, ensuring safety and reliability. A key differentiator for Mersen Class T fuse blocks is the inclusion of high conductivity copper box connectors. These connectors are specifically designed with the same coefficient of expansion as copper wire, providing superior heat cycling performance and meeting or exceeding OEM "no aluminum" specifications. This makes them ideal for use with copper wires only, ensuring optimal electrical connection integrity. The Mersen 34051T is compatible with Class T fuses, specifically A3T fuses for 300V applications. It offers a robust connection solution for demanding electrical systems where high current protection is essential. Mersen is the only manufacturer to offer Class T blocks with copper connectors, highlighting a commitment to superior material selection and performance. This fuse block meets UL 4248 requirements and is UL listed (guide IZLT, File E52283) and CSA certified (class 6225, File 32169). The copper box connectors are rated for wire ranges of 600 kcmil-#2 and require a torque of 375 In-lbs for secure installation.
  • 1-Pole Class T Fuse Block
  • 400 Ampere Rating
  • 300 VAC / 300 VDC Voltage Rating
  • Durable GFPC or Phenolic Insulation
  • High Conductivity Copper Box Connectors for Copper Wire

Specifications

AC Voltage Rating
300 V
Amperage Rating
400 A
Brand Name
Mersen
Class
Class T
Connection
Copper Box
DC Voltage Rating
300 V
Material
Phenolic
Maximum Operating Temperature
80 C
Mounting
Direct Screw Mount
Number Of Poles
1
Phase
1
Size
6 x 2.25 x 2.99 in
Size
152.4 x 57.15 x 75.946 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
300 VAC
Package Dimensions (L x W x H)
6 in x 2.25 in x 2.99 in
Package Dimensions (L x W x H)
152.4 mm x 57.15 mm x 75.946 mm
Package Weight (Imperial)
1.600 lb
Package Weight (Metric)
0.726 kg
Fuse Block 300VAC 300VDC Class T 400A 1-Pole Box with Reinforced Clip

34031T

Fuse Block 300VAC 300VDC Class T 400A 1-Pole Box with Reinforced Clip
POWER DISTRIBUTION BLOCK COVER

LCH133-1

POWER DISTRIBUTION BLOCK COVER
D2.5/8SFT ADO

1SNA199184R1100

D2.5/8SFT ADO

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.