Why Choose the Mersen Q090473 Protistor® High-Speed Fuse?
The Mersen Q090473 (D2122GC75V500TF) is a premium Protistor® square body high-speed semiconductor fuse developed to provide outstanding protection for sensitive power electronic equipment operating in demanding DC applications. Designed for railway power and auxiliary circuits, this fuse delivers exceptionally fast fault interruption to safeguard semiconductors including IGBTs, thyristors, diodes and rectifiers from damaging short-circuit currents.
Part of the proven Mersen Protistor® Sizes 2x122 and 2x123 gR 750 VDC series, the Q090473 features low let-through energy (I²t), reduced power dissipation and long operational life. Its dual-element square body construction with metric threaded flush-end terminals and an integrated striker provides dependable protection while simplifying installation and remote fuse indication.
Rated at 500 A with a 750 V DC (IEC) voltage rating and a 100 kA DC breaking capacity, the Q090473 is ideally suited to railway applications, battery energy storage systems, industrial DC drives, renewable energy installations and high-power converters where reliable semiconductor protection is essential.
Key Advantages
- High-speed gR semiconductor protection fuse.
- 500 A current rating for demanding DC applications.
- 750 V DC IEC voltage rating.
- 100 kA DC breaking capacity.
- Low I²t minimises damage to expensive semiconductor devices.
- Integrated striker for remote fuse indication.
- Designed specifically for railway power and auxiliary circuits.
Key Features
- Mersen Protistor® Sizes 2x122 and 2x123 gR series.
- Manufacturer part number: Q090473.
- Catalogue number: D2122GC75V500TF.
- 500 A rated current.
- 750 V DC IEC rated voltage.
- Square body high-speed semiconductor fuse.
- Metric threaded flush-end terminals.
- Integrated striker indicator.
Reliable Protection for High-Power DC Systems
High-speed semiconductor fuses are engineered to protect costly power electronic components against destructive short-circuit currents. Their extremely rapid operating characteristics reduce thermal and electrical stress, helping maximise equipment availability while reducing repair costs and downtime.
The Mersen Protistor® DC range has been specifically developed for modern railway equipment and high-power DC applications, offering improved performance, lower power losses and longer service life than conventional fuse technologies.
Typical Applications
- Railway traction and auxiliary power systems.
- Battery energy storage systems (BESS).
- Industrial DC drives.
- Power converters and rectifiers.
- Renewable energy installations.
- UPS and critical DC power systems.
- Protection of IGBTs, thyristors and other semiconductor devices.
