Why Choose the Mersen Q085252 Protistor® High-Speed Fuse?
The Mersen Q085252 (D121GC75V250TF) is a premium Protistor® square body high-speed semiconductor fuse engineered to provide ultra-fast protection for sensitive power electronic equipment. Designed specifically for demanding DC applications, this fuse protects semiconductors including IGBTs, thyristors, diodes and rectifiers from damaging short-circuit currents while helping maximise equipment reliability.
As part of the trusted Mersen Protistor® Size 121 gR 750 VDC series, the Q085252 combines low let-through energy with a high breaking capacity to minimise thermal and electrical stress on expensive semiconductor components. Its robust square body construction, flush-end metric threaded terminals and integrated striker ensure dependable long-term performance in demanding industrial and railway environments.
Rated at 250 A with a 750 V DC (IEC) voltage rating, the Q085252 is ideally suited to railway auxiliary systems, battery energy storage, industrial DC drives, power converters and renewable energy installations requiring dependable semiconductor protection.
Key Advantages
- High-speed gR semiconductor protection fuse.
- 250 A current rating for demanding DC applications.
- 750 V DC IEC rated voltage.
- Protects IGBTs, thyristors, diodes and rectifiers.
- Low I²t characteristics minimise semiconductor damage.
- Integrated striker for remote fuse indication.
- Square body design with flush-end threaded terminals.
Key Features
- Mersen Protistor® Size 121 gR series.
- Manufacturer part number: Q085252.
- Catalogue number: D121GC75V250TF.
- 250 A rated current.
- 750 V DC IEC rated voltage.
- Square body high-speed semiconductor fuse.
- Flush-end metric threaded terminals.
- Integrated striker indicator.
Reliable Protection for Critical Power Electronics
High-speed semiconductor fuses are specifically designed to protect sensitive electronic power devices from damaging fault currents. Their ultra-fast operating characteristics reduce thermal and electrical stress, helping extend equipment life while reducing costly downtime and repairs.
The Mersen Protistor® range is widely specified by OEMs, railway engineers, panel builders and industrial automation specialists for battery systems, DC drives, power conversion equipment and renewable energy applications where dependable semiconductor protection is essential.
Typical Applications
- Railway auxiliary power systems.
- Battery energy storage systems.
- Industrial DC drives.
- Power converters and rectifiers.
- Renewable energy installations.
- UPS and critical power equipment.
- Industrial semiconductor protection.
