Mersen 70308 - Fuse Block 750VAC 750VDC 30A 3-Pole Box with Reinforced Clip
Mersen

70308

Alternate Item Number: 70308

UPC: 782001754266


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Overview

The Mersen 70308 is a 3-pole fuse block designed for high-voltage industrial applications, rated at 750VAC and 750VDC with a 30A current capacity. This fuse block accommodates IEC cylindrical fuses in sizes 14 x 51mm or 22 x 58mm, making it versatile for semiconductor and power distribution systems. The reinforced clip design ensures secure fuse retention and high conductivity, while the box connector type supports copper wiring only, meeting OEM 'no aluminum' specifications. The reinforced clip design enhances durability and reduces contact resistance, improving thermal cycling performance. The 70308 features a dielectric strength exceeding 2500V, ensuring reliable insulation in high-voltage environments. The open-face style allows for easy fuse replacement and inspection, reducing downtime. Compatible with Mersen's adder-block design, the 70308 can be combined with 1-, 2-, or 3-pole blocks to create multi-pole segmented holders, offering design flexibility. All fuse clips are made of high-conductivity tin-plated copper, ensuring optimal electrical performance. The 70308 is UL listed (Guide IZLT, File E52283) and CSA certified (Class 6225, File 32169), meeting rigorous safety standards for industrial applications.
  • Rated 750VAC/750VDC, 30A current capacity
  • Accommodates IEC 14x51mm or 22x58mm cylindrical fuses
  • Reinforced tin-plated copper clips for high conductivity and durability
  • Box connector type for copper wiring only (meets OEM 'no aluminum' specs)
  • Dielectric strength exceeds 2500V for reliable insulation

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
Box with Reinforced Clip
Connection Type
Box
Current Rating
30A
DC Voltage Rating
750 V
Material
Thermoplastic
Material
Tin-Plated Copper
Maximum Operating Temperature
80 C
Mounting
Direct Screw Mount
Mounting Type
DIN-rail adapter (U710 only)
Number Of Poles
3-pole
Phase
3
Poles
3-pole
Size
3 x 3 x 1.37 in
Size
76.2 x 76.2 x 34.798 mm
Size
14 x 51mm or 22 x 58mm (IEC Cylindrical fuses)
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 3 in x 1.37 in
Package Dimensions (L x W x H)
76.2 mm x 76.2 mm x 34.798 mm
Package Weight (Imperial)
0.380 lb
Package Weight (Metric)
0.172 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.