Mersen 70305 - Fuse Block 750VAC 750VDC 30A Adder Screw
Mersen

70305

Alternate Item Number: 70305

UPC: 782001754235


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Overview

Mersen Semiconductor fuse blocks feature open face styles. Each version is rated 750 volts and accommodates 14 x 51mm or 22 x 58mm IEC Cylindrical fuses. 703, U705 and U710 fuseholders feature Mersen's unique adder-block design which can be assembled onto 1, 2, or 3-pole fuseholders to form multi-pole segmented holders of as many poles as desired. A choice of box, screw, or pressure plate connectors is offered to fit a wide range of standard or solid copper wire. All versions have verified dielectric strength in excess of 2500V. A patented built-in DIN-rail adapter on the U710 blocks adds further design versatility. All fuse clips are made of high conductivity tin-plated copper with spring reinforced clips.

    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
    Screw
    DC Voltage Rating
    750 V
    Material
    Thermoplastic
    Maximum Operating Temperature
    80 C
    Mounting
    Direct Screw Mount
    Number Of Poles
    1
    Phase
    1
    Size
    3 x 0.97 x 1.37 in
    Size
    76.2 x 24.638 x 34.798 mm
    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 0.97 in x 1.37 in
    Package Dimensions (L x W x H)
    76.2 mm x 24.638 mm x 34.798 mm
    Package Weight (Imperial)
    0.100 lb
    Package Weight (Metric)
    0.045 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.