Mersen R085253 - Square Body High-Speed Fuse Protistor® Size 120 gR 750VDC IEC 160A With Striker Flush ends metric threads
Mersen

R085253

Alternate Item Number: D120GC75V160TF


Documents & Media
Specification Sheet

Contact for Pricing

Overview

The Mersen Protistor® Size 120 gR high-speed fuse-link (SKU: R085253) is engineered for robust DC power circuit protection, particularly in semiconductor and railway applications. This square-body fuse-link operates at 750VDC (IEC) and features a 160A current rating. Its design includes flush ends with metric threads for secure mounting and an integrated striker for remote fuse operation indication. Engineered for elevated temperature operation, the R085253 delivers lower I²t values, minimizing damage to protected components during short circuits. It boasts a rated breaking capacity of 160kA and a power dissipation of 330W at its rated current, optimizing fault isolation in high-performance DC systems. Typical applications include traction power systems, DC switchgear, semiconductor protection in converters, and auxiliary railway circuits where fast-acting, reliable protection is essential. Meeting IEC standards for semiconductor fuses, this fuse-link ensures compliance with stringent industrial and railway safety requirements. The metric thread design facilitates easy installation in standard fuse holders, even in confined spaces, while maintaining high interrupting ratings. The striker mechanism provides crucial visual or electrical feedback for rapid fault diagnosis and system recovery. As part of Mersen’s DC semiconductor protection portfolio, the Protistor® series is widely deployed in traction power substations, industrial drives, and renewable energy systems where DC fault currents can be substantial. The compact square body design enhances thermal management, reducing hotspot formation and extending operational life under continuous duty cycles. Key specifications include a rated breaking capacity of 160 kA and a power dissipation of 330 W at rated current.
  • Mersen Protistor® Size 120 gR High-Speed Fuse-Link
  • Rated for 750VDC (IEC) and 160A
  • Square body design with flush ends and metric threads
  • Integrated striker for remote fuse operation indication
  • 160kA rated breaking capacity for robust fault protection
  • Designed for elevated temperature operation in DC circuits
  • Lower I²t minimizes damage to protected components during faults
  • Compliant with IEC standards for semiconductor protection
  • Typical applications: traction power systems, railway auxiliary circuits, industrial DC drives

Specifications

Amperage Rating
160 A
Application
Protection of inverters Protection of motor drives Protection of UPS systems Railway power and auxiliary circuits 750VDC or less equipments
Brand Name
Mersen
Case
Ceramic
Connection
End Contact with Threaded Holes
Connection Type
Flush Metric Threads
Connection Type
metric threads
Current Rating
160 A
DC Voltage Rating
750 V
Mounting
Bolted
Mounting Type
Flush ends
Mounting Type
Fuse holder
Series
Protistor®
Size
5 x 1.57 x 1.77 in
Size
127 x 40 x 45 mm
Size
Size 120
Size
Size 120 gR
Special Features
Multiple body sizes and terminals or blades combination Very low I²t Extremely fast acting Eliminate all overloads Excellent cycling capability
Standard
EU conformity REACH compliant IEC 60269-4 Compliance
Sub Brand
Protistor®
Type
Square Body High-Speed Fuse-Links DC Protection
Type Of Indicators
Striker
Voltage Rating
750 V
Wattage
27 W
Package Dimensions (L x W x H)
5 in x 1.57 in x 1.77 in
Package Dimensions (L x W x H)
127 mm x 40 mm x 45 mm
Package Weight (Imperial)
1.433 lb
Package Weight (Metric)
0.650 kg
Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount

GPM-SRR90

Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount
Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20
Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20

C331156

Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20
Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8

1SCM8

Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8
9F61 Size B Clips 1.6in

9F61BWW460

9F61 Size B Clips 1.6in
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.

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.