Mersen M085203 Square Body High-Speed Fuse Protistor® Size 121 gR 750VDC IEC 250A With Striker Open…
Alternate Item Number: D121GC75V250EF
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Contact for Pricing
Call +1 (262) 252-1600 (toll-free 877-268-3700) or email [email protected] for pricing and availability.
Overview
- Square body design with open slot blades for secure mounting
- Rated 250A at 750VDC with 150kA breaking capacity
- Pre-arcing I²t of 28kA²s and clearing I²t of 220kA²s
- Integrated striker mechanism for operational feedback
- Lower power dissipation and extended operational life
Specifications
Amperage Rating | 250 A |
Application | Protection of inverters Protection of motor drives Protection of UPS systems Railway power and auxiliary circuits Similar 750VDC or less equipments |
Brand Name | Mersen |
Case | Ceramic |
Connection | Open Slot Blades |
DC Voltage Rating | 750 V |
Mounting | Bolted |
Size | 7.52 x 2.01 x 2.17 in |
Size | 191 x 51 x 55 mm |
Special Features | Multiple body sizes and terminals or blades combination Very low I²t Extremely fast acting Eliminate all overloads Excellent cycling capability |
Standard | 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 | 46.7 W |
Package Dimensions (L x W x H) | 7.52 in x 2.01 in x 2.17 in |
Package Dimensions (L x W x H) | 191 mm x 51 mm x 55 mm |
Package Weight (Imperial) | 2.255 lb |
Package Weight (Metric) | 1.023 kg |
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Frequently Asked Questions
What is the rated voltage for the Protistor size 121 gR fuse?
The rated voltage for the Protistor size 121 gR fuse is 750VDC according to IEC standards.
What is the ampere range for this fuse series?
The Protistor size 121 gR fuse series has an ampere range from 200 A to 250 A.
What are the main applications for these DC protection fuses?
These fuses are used for protecting inverters, motor drives, UPS systems, and railway power/auxiliary circuits.
What standards does this fuse comply with?
These fuse-links comply with the IEC 60269-4 standard.
What is the breaking capacity of the 250A fuse?
The rated breaking capacity DC for the 250A fuse is 100 kA.
What is the power dissipation for the 250A fuse at rated current?
The power dissipation for the 250A fuse at its rated current is 46.7 W.
What is the weight of the Protistor size 121 gR fuse?
The Protistor size 121 gR fuse weighs 1.02 kg for both EF and TTF types.
What is the pre-arcing I²t for the 200A fuse?
The pre-arcing I²t for the 200A fuse is 11.85 kA²s.
What is the maximum I²t at 900V for the 250A fuse with IP=10In?
The maximum I²t at 900V for the 250A fuse with IP=10In is 1250 kA²s.
What are the key features of these high-speed fuse-links?
Key features include very low I²t, extremely fast acting, elimination of overloads, and excellent cycling capability.
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.