Mersen A720R12R - 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 12 R A720R Series.
Mersen

A720R12R

Alternate Item Number: A720R12R

UPC: 782001800918

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Overview

The Mersen A720R12R is a high-performance R-Rated fuse engineered for critical short-circuit protection in medium voltage motor applications. As a current-limiting device, it plays a vital role in safeguarding expensive motor windings and associated control equipment from damaging fault currents. These fuses are specifically designed as back-up protection, meaning they are intended to operate in conjunction with overload relays within combination motor starters. This coordination is paramount for ensuring both overcurrent and short-circuit protection are effectively managed, a requirement typically dictated by the motor starter manufacturer. The A720R series from Mersen offers robust construction and reliable performance. This particular model, the A720R12R, is rated for 7200 Volts, making it suitable for a wide range of industrial power systems. It features a 12 R rating, indicating its specific characteristics within the R-Rated fuse family. The fuse is equipped with standard ferrules for secure electrical connection and is designed to mount within spring-reinforced clips. This mounting system ensures a firm and reliable connection, even in environments subject to vibration or thermal cycling, which are common in industrial settings. Available with either a 3-inch (Size D) or 4-inch (Size E) diameter barrel, the A720R12R provides flexibility for integration into various motor starter configurations. The choice between barrel sizes often depends on the physical constraints and specific design requirements of the motor control center or starter enclosure. Mersen's reputation for quality and reliability in electrical protection devices makes the A720R series a trusted choice for engineers and maintenance professionals seeking dependable motor protection. Key features and benefits of the Mersen A720R12R R-Rated Fuse include: * **Superior Short-Circuit Protection:** Effectively limits damaging fault currents, protecting motor windings and control gear. * **Current-Limiting Design:** Minimizes peak let-through current, reducing stress on connected equipment. * **Medium Voltage Application:** Rated for 7200V, ideal for industrial motor control systems. * **Back-Up Fuse Functionality:** Designed for coordination with overload relays in combination motor starters. * **Robust Construction:** Features ferrules for secure connection and spring-reinforced clips for reliable mounting. * **Flexible Mounting Options:** Available in 3-inch (Size D) or 4-inch (Size E) diameter barrels to suit various enclosures. * **Mersen Quality:** Backed by a leading manufacturer known for reliable electrical protection solutions. Proper selection and coordination of R-Rated fuses like the A720R12R are essential for maintaining operational continuity and safety in industries such as manufacturing, mining, oil and gas, and utilities. By understanding the specific requirements of the motor and starter, professionals can ensure optimal protection against electrical hazards.
  • Mersen A720R12R R-Rated fuse for medium voltage motor short-circuit protection.
  • 7200V voltage rating for robust industrial applications.
  • Current-limiting design with a minimum interrupting rating.
  • Features 3 or 4 inch diameter barrels (Size D or E) with ferrules.
  • Mounts in spring-reinforced clips for secure and reliable installation.

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-inch (Size D) or 4-inch (Size E) diameter barrel
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 6.41 IN
Package Dimensions (L x W x H)
53.34 cm x 7.874 cm x 16.2814 cm
Package Weight (Imperial)
12.000 L
Package Weight (Metric)
5.443 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.