Why Choose the Mersen R090474 Protistor® High-Speed Fuse?
The Mersen R090474 (D2122GC75V630TF) is a Protistor® square body high-speed semiconductor fuse developed to provide exceptional protection for modern power electronic equipment operating on demanding DC systems. It is specifically designed to protect IGBTs, thyristors, diodes and other semiconductor devices against damaging short-circuit currents while minimising let-through energy and reducing downtime.
Part of the Protistor® Size 2x122 gR 750 VDC series, this fuse features a robust square-body ceramic construction with flush-end metric threaded terminals and an integrated striker for remote fuse indication. The design provides excellent cycling capability, low power losses and long service life in railway and industrial DC applications.
Rated at 630 A and 750 V DC (IEC), with a 100 kA DC breaking capacity, the R090474 is ideally suited to railway traction equipment, battery energy storage systems, industrial converters, UPS systems and renewable energy installations.
Key Advantages
- High-speed gR semiconductor protection.
- 630 A current rating.
- 750 V DC (IEC) voltage rating.
- 100 kA DC interrupting capacity.
- Very low I²t for superior semiconductor protection.
- Integrated striker for remote indication.
- Flush-end metric threaded terminals for secure installation.
- Long operating life with low power dissipation.
Key Features
- Manufacturer: Mersen.
- Series: Protistor® Size 2x122 gR.
- Item number: R090474.
- Catalogue number: D2122GC75V630TF.
- Square body high-speed semiconductor fuse.
- Flush-end metric threaded terminals.
- Integrated striker indication.
- Designed for demanding DC power applications.
High-speed semiconductor fuses are designed specifically to protect expensive semiconductor devices by interrupting extremely high fault currents before thermal damage occurs. Their rapid operation significantly reduces electrical stress, helping extend equipment life and minimise costly downtime.
The Protistor® DC range has been developed for railway power and auxiliary circuits together with industrial DC installations where dependable protection of semiconductor devices is essential.
Typical Applications
- Railway traction and auxiliary power systems.
- Industrial DC drives.
- Battery energy storage systems (BESS).
- Power converters and rectifiers.
- UPS installations.
- Renewable energy converters.
- Protection of IGBTs, thyristors, diodes and power semiconductors.
