Mersen 24051 - Fuse Block 250VAC 250VDC Class H/K 400A 1-Pole Copper Box Side Clip
Mersen

24051

Alternate Item Number: 24051

UPC: 782001664497

Contact for Pricing

Overview

The Mersen 24051 is a single-pole fuse block engineered for high-performance Class H and K fuse applications, rated for both 250VAC and 250VDC with a continuous current capacity of 400A. The design incorporates copper box connectors and copper fuse clips, specifically optimized for use with copper conductors only. This copper-to-copper interface ensures a consistent coefficient of thermal expansion, minimizing thermal stress during heat cycling and maintaining reliable electrical contact over time. The construction meets or exceeds OEM "no aluminum" specifications, eliminating compatibility concerns with aluminum wiring systems. The phenolic insulator provides superior dielectric strength, ensuring safe operation in high-voltage environments. The fuse block is designed to accommodate a wide range of wire sizes, from 1000 kcmil down to 250 kcmil, offering flexibility for various power distribution applications. For secure installation, the recommended torque for the connector is 375 in-lbs, while mounting requires 5/16" diameter screws (0.313" dia.). As part of Mersen’s extensive portfolio of Class H, K, and R fuse blocks, the 24051 delivers consistent performance in demanding power distribution and circuit protection scenarios. The product is manufactured in the United States under Mersen’s quality-controlled processes. SKU: 24051. Country of Origin: US.
  • 250VAC/DC, 400A rating
  • Single-pole configuration
  • Class H and K fuse compatibility
  • Copper box connectors and copper fuse clips
  • Phenolic insulator for enhanced durability

Specifications

AC Voltage Rating
250 V
Amperage Rating
400 A
Brand Name
Mersen
Class
Class H/K
Connection
Box Side-Clip
Connection Type
Box Side Clip
Current Rating
400A
DC Voltage Rating
250 V
Material
Copper
Material
Phenolic
Maximum Operating Temperature
80 C
Mounting
Direct Screw Mount
Mounting Type
Snap-on adder block
Number Of Poles
1
Phase
1
Poles
1-pole
Size
12 x 4 x 3.75 in
Size
304.8 x 101.6 x 95.25 mm
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
250 VAC
Package Dimensions (L x W x H)
12 in x 4 in x 3.75 in
Package Dimensions (L x W x H)
304.8 mm x 101.6 mm x 95.25 mm
Package Weight (Imperial)
3.800 lb
Package Weight (Metric)
1.724 kg
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Fuse Block 250VAC 250VDC Class H/K 100A Adder Copper Box
OMNI-BLOK MTG 1 POLE. A low profile fuse block featuring individual barriers which reinforce the fuse clips while providing greater protection against clip damage and electrical shock. The unique design permits self-alignment of clips to fuse cap. This, plus a one-piece clip/terminal assures low contact resistance. Higher current ratings have been attained using spring brass clips. With the exception of the two-pole unit, multiple pole units may be broken apart to obtain desired number of poles.

354901-GY

OMNI-BLOK MTG 1 POLE. A low profile fuse block featuring individual barriers which reinforce the fuse clips while providing greater protection against clip damage and electrical shock. The unique design permits self-alignment of clips to fuse cap. This, plus a one-piece clip/terminal assures low contact resistance. Higher current ratings have been attained using spring brass clips. With the exception of the two-pole unit, multiple pole units may be broken apart to obtain desired number of poles.
DR4/8 SF DIN2

1SNA110368R1200

DR4/8 SF DIN2

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.