Mersen L075703 - High-Speed Cylindrical Fuse Protistor® Size 27x60 gR (gRB) 660VDC IEC 12A With Striker
Mersen

L075703

Alternate Item Number: FD27GB66V12T


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Specification Sheet

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Overview

The Mersen Protistor® L075703 is a high-speed cylindrical fuse designed for DC semiconductor protection. This gR (gRB) rated fuse features a 27x60mm size and a 660VDC voltage rating, making it suitable for demanding DC applications. With a 12A current rating, it offers precise overcurrent protection for sensitive electronic components. The fuse boasts a pre-arcing I²t of 180 A²s and a clearing I²t of 90 kA, ensuring rapid fault interruption and minimizing damage. Its power dissipation at rated current is 2.5W. A key feature is the integrated striker, providing visual or remote indication of fuse operation. Manufactured in the US, this Protistor® fuse is engineered for applications requiring fast response times and high breaking capacity, such as railway power and auxiliary circuits. The low I²t values are critical for protecting semiconductor devices from short-circuit damage, even at elevated operating temperatures. Trust Mersen's expertise for reliable DC protection.
  • Mersen Protistor® Series High-Speed Fuse
  • Size: 27x60mm
  • Rated Voltage: 660VDC
  • Rated Current: 12A
  • Features integrated striker for operation indication
  • Striker for visual/remote indication
  • Designed for semiconductor protection in DC circuits
  • Operates at elevated temperatures with lower I²t
  • Manufactured in the US by Mersen
  • Suitable for railway power and auxiliary circuits

Specifications

Amperage Rating
12 A
Application
DC control circuit, measuring & monitoring auxiliaries circuit
Brand Name
Mersen
Case
Ceramic
Connection
Ferrule
Current Rating
12 A
DC Voltage Rating
660 V
Mounting
Clip
Series
Protistor®
Size
27x60 gR
Size
2.37 x 1.06 in
Size
60.3 x 27 mm
Sub Brand
Protistor®
Type
IEC High-Speed Cylindrical Fuse-Links DC Protection
Type Of Indicators
Striker
Voltage Rating
660 V
Wattage
2.4 W
Package Dimensions (L x W x H)
2.37 in x 1.06 in x 1.06 in
Package Dimensions (L x W x H)
60.3 mm x 27 mm x 27 mm
Package Weight (Imperial)
0.176 lb
Package Weight (Metric)
0.080 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.

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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.

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.