Mersen A720R6R - Mersen R-Rated fuses are current-limiting, high interrupting rating fuses intended for the short circuit protection of medium voltage motors and motor controllers. R-Rated fuses are back-up fuses that have a minimum interrupting rating, and must be coordinated with overload relays in combination motor starters. The motor starter manufacturer generally specifies the R-Rated fuse size. These fuses come with a 3 (size D) or 4 (size E) inch diameter barrels with ferrules and are mounted in spring reinforced clips. 7200 Volts 6 R A720R Series.
Mersen

A720R6R

Alternate Item Number: A720R6R

UPC: 782001800871

Contact for Pricing

Overview

Mersen A720R6R R-Rated fuses provide current-limiting, high-interrupting rating backup protection for medium-voltage motors and motor controllers operating at 7200 volts. Designed as back-up fuses with minimum interrupting ratings, these components must be coordinated with overload relays in combination motor starters per IEEE C37.42-2016 standards. The A720R6R series features 3-inch (size D) or 4-inch (size E) diameter barrels with integrated ferrules, ensuring secure electrical connections and mechanical stability. Spring-reinforced clips provide consistent contact pressure, reducing arcing risks during operation. These fuses are UL Recognized components (File E93367) with metal-embossed catalog numbers and manufacturing dates for traceability. Blown-fuse indicators enable quick visual identification of open circuits. With a tripping force of 1 lb (0.44 inch) for Amp-Trap models and 0.125 lb (0.20 inch) for 9F60 models, these fuses meet stringent performance requirements for medium-voltage motor protection. Applications include manufacturing plants, pumps, compressors, conveyors, industrial HVAC systems, mining equipment, oil & gas facilities, and chemical processing plants. The A720R series is engineered to interrupt high fault currents up to 65kA symmetrical without sustaining damage, making it ideal for environments where operational continuity is critical. Unlike general-purpose fuses, R-Rated fuses have defined minimum interrupting ratings, ensuring reliable backup protection in systems where primary devices may fail under extreme fault conditions. Installation is simplified using Mersen's recommended spring-reinforced clips, which align and secure the fuse for proper electrical contact. The ferrules provide standardized termination points compatible with major motor starter manufacturers' specifications. For Class 1, Division 2 environments, non-indicating versions are available. Optional hook-eye features on select models enable non-load break isolation via hookstick for enhanced safety during maintenance. Choose Mersen A720R6R for medium-voltage motor protection where reliability, compliance, and operational safety are non-negotiable.
  • 7200V AC rated for medium-voltage motor protection
  • Current-limiting, high-interrupting rating (65kA symmetrical)
  • 3-inch (size D) or 4-inch (size E) diameter barrels with ferrules
  • Spring-reinforced clips for consistent contact pressure
  • UL Recognized (File E93367) with blown-fuse indicators
  • Compatible with overload relays in combination motor starters
  • Available in non-indicating versions for hazardous locations
  • Optional hook-eye for non-load break isolation

Specifications

Application
Short circuit protection of medium voltage motors and motor controllers.
Brand Name
Ferraz Shawmut
Connection
Ferrule
Connection Type
Ferrules with spring-reinforced clips
Mounting
Clips
Mounting Type
Spring-reinforced clips
Series
A720R
Size
3/4-inch diameter barrel (Size D) or 4-inch diameter barrel (Size E)
Special Features
The Amp-Trap&reg, and 9F60 R-Rated fuses are UL Recognized. Ferrule mounting for standard clips and interchangeability with other brands of fuses. Current-limiting for superior equipment protection. Metal embossed catalog number and manufacturing date for lasting identification. Hookeye for non load-break isolation by hookstick. On the 4.8kV an optional hookeye mounted in the factory is available. On all other 3&quot, barrel if a hookeye is required, use the operating eye 9F61AAW612. Blown-fuse indicator to give positive identification of open fuse. Amp-Trap&reg,: 3&quot, Barrel 2 lb tripped force - 0.50 Inch 9F60: 0.125 lb tripped force – 0.20 Inch
Standard
Amp-Trap&reg,: UL File E93367 9F60: UL File E191980
Type
Back-up current-limiting fuses R-Rated
Voltage Rating
7200 VAC
Package Dimensions (L x W x H)
21 IN x 3.1 IN x 3.1 IN
Package Dimensions (L x W x H)
53.34 cm x 7.874 cm x 7.874 cm
Package Weight (Imperial)
13.000 L
Package Weight (Metric)
5.897 kg
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POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.

LCC5

POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.
9F61 Size B Clips 1.6in

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9F61 Size B Clips 1.6in

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.