Why Choose the Mersen N085250 High-Speed Semiconductor Fuse?
The Mersen N085250 (D121GC75V200TF) is a Protistor® Size 121 square body high-speed semiconductor fuse designed to provide exceptional protection for power semiconductor devices used in railway traction systems, industrial DC converters, battery energy storage systems and renewable energy installations. Engineered specifically for demanding DC applications, it rapidly interrupts fault currents to minimise damage to valuable power electronic components while maximising system reliability.
Rated at 200 A with a 750 V DC (IEC) voltage rating, the N085250 features a gR operating characteristic, providing full-range protection against both overloads and short circuits. It incorporates flush-end metric threaded terminals together with an integrated striker indicator for secure installation and simplified maintenance.
As part of the proven Mersen Protistor® semiconductor protection range, the N085250 has been developed for modern high-performance DC equipment operating at elevated temperatures, offering low I²t characteristics, reduced power losses and long service life in demanding industrial environments.
Key Advantages
- High-speed gR semiconductor protection for overload and short-circuit conditions.
- 200 A current rating with 750 V DC IEC operation.
- 100 kA DC breaking capacity for dependable fault interruption.
- Low I²t characteristics help minimise damage to semiconductor devices.
- Integrated striker indicator enables rapid fuse status identification.
- Designed for railway, industrial DC, renewable energy and battery storage applications.
Key Features
- Mersen Protistor® Size 121 semiconductor fuse.
- Manufacturer reference: N085250.
- Catalogue number: D121GC75V200TF.
- Square body ceramic construction.
- Flush-end metric threaded terminals.
- Integrated striker indication.
- Bolted installation.
- RoHS compliant.
Designed for High-Performance DC Power Systems
High-speed semiconductor fuses are specifically engineered to protect IGBTs, diodes, thyristors and other sensitive power electronic devices by limiting fault energy before damaging levels are reached. Their rapid current-limiting performance helps improve equipment reliability, reduce repair costs and minimise operational downtime.
The Protistor® Size 121 series is widely used in railway auxiliary systems, industrial power converters, renewable energy installations and battery energy storage systems where dependable semiconductor protection is essential.
Typical Applications
- Railway traction and auxiliary power systems.
- Industrial DC converters and inverters.
- Battery energy storage systems (BESS).
- Renewable energy power conversion equipment.
- Protection of IGBTs, thyristors and diodes.
- High-power semiconductor installations.
