Mersen 70357 - Fuse Block 750VAC 750VDC 30A 2-Pole Copper Box
Mersen

70357

Alternate Item Number: 70357

UPC: 782001754372


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Overview

The Mersen 70357 is a robust 2-pole fuse block engineered for IEC cylindrical fuses measuring 14 x 51mm. This unit is equipped with reliable copper box connectors and tin-plated copper clips, ensuring optimal performance exclusively with copper wires. The Mersen 70357 is rated for a substantial 750VAC and 750VDC at a continuous current of 30A, making it an ideal choice for applications demanding robust DC voltage handling capabilities. The connector configuration is a box connector, designed to accommodate copper wire sizes from #4 AWG down to #14 AWG. For secure mounting, the fuse block utilizes screw attachment, with a recommendation for #10 screws, which have a diameter of .190 inches. The innovative adder-block design of the Mersen 70357 facilitates its assembly into multi-pole configurations, offering flexibility in system design. Demonstrating superior electrical insulation, the dielectric strength of this fuse block exceeds 2500V. It is compatible with both standard and solid copper wire types. Manufactured by Mersen, this product carries the SKU 70357. Source Catalog Data confirms its compatibility with 14x51mm fuses and specifies a connector torque of 35 In-Lb. The Mersen 70357 is a key component within Mersen's comprehensive 750 Volt fuse holder series.
  • 2-Pole fuse block for IEC cylindrical fuses (14 x 51mm)
  • Rated for 750VAC / 750VDC and 30A
  • Copper box connectors and tin-plated copper clips for copper wire only
  • Wire range: #4-14 AWG copper wire
  • Screw mounting with recommended #10 screws (.190" dia.)

Specifications

AC Voltage Rating
750 V
Amperage Rating
30 A
Application
All circuits up to 750 volts using semiconductor fuses for protection of small inverters, UPS systems, motor drives, etc.
Brand Name
Mersen
Class
IEC Cylindrical 14x51mm
Connection
Copper Box
Connection Type
Box, Screw, or Pressure Plate
Current Rating
30A
DC Voltage Rating
750 V
Material
Thermoplastic
Material
Copper
Maximum Operating Temperature
80 C
Mounting
Direct Screw Mount
Mounting Type
DIN-rail (U710), Adder-block assembly
Number Of Poles
2-pole
Phase
2
Poles
2
Size
3 x 2.03 x 1.37 in
Size
76.2 x 51.562 x 34.798 mm
Size
14 x 51mm or 22 x 58mm (fuse accommodation)
Special Features
Thermoplastic bases DIN-rail (U710) or Screw Mount Adder block design
Standard
UL Recognized component guide IZLT2, File E52283 CSA Certified class 6225, File 32169
Type
Semiconductor & Special Purpose Fuse Bases & Accessories
Voltage Rating
750 VAC
Package Dimensions (L x W x H)
3 in x 2.03 in x 1.37 in
Package Dimensions (L x W x H)
76.2 mm x 51.562 mm x 34.798 mm
Package Weight (Imperial)
0.230 lb
Package Weight (Metric)
0.104 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.