Why Choose the Mersen P220951 Protistor® High-Speed Fuse?
The Mersen P220951 (D122GD75V450EF) is a premium Protistor® square body high-speed semiconductor fuse designed to provide exceptional protection for sensitive power electronic equipment operating in demanding DC applications. Engineered to safeguard semiconductors such as IGBTs, thyristors, diodes and rectifiers, this fuse delivers rapid fault interruption to minimise damage during short-circuit events.
As part of the proven Mersen Protistor® Size 122 gR 750 VDC series, the P220951 combines low let-through energy with a high breaking capacity, making it ideal for protecting modern power conversion equipment. Its square body construction, open slot blade terminals and integrated striker ensure dependable operation while simplifying installation and remote fuse indication.
Rated at 450 A with a 750 V DC IEC voltage rating, the P220951 is widely used in railway auxiliary systems, battery energy storage, industrial drives, DC power supplies and renewable energy installations where reliable semiconductor protection is essential.
Key Advantages
- High-speed gR semiconductor protection fuse.
- 450 A current rating for demanding industrial DC applications.
- 750 V DC IEC rated voltage.
- Protects IGBTs, thyristors, diodes and rectifier assemblies.
- Low I²t characteristics minimise semiconductor damage.
- Integrated striker for remote fuse indication.
- Robust square body construction with open slot blade terminals.
Key Features
- Mersen Protistor® Size 122 gR series.
- Manufacturer part number: P220951.
- Catalogue number: D122GD75V450EF.
- 450 A rated current.
- 750 V DC IEC rated voltage.
- Square body high-speed semiconductor fuse.
- Open slot blade connections.
- Integrated striker indicator.
Reliable Protection for Critical Power Electronics
High-speed semiconductor fuses are designed to protect expensive electronic power devices from damaging fault currents. Their rapid operating characteristics reduce thermal and electrical stress, helping extend equipment life while minimising costly downtime.
The Mersen Protistor® range is widely specified for railway systems, industrial automation, renewable energy installations and power conversion equipment where dependable semiconductor protection is critical for operational reliability.
Typical Applications
- Railway traction and auxiliary power systems.
- Battery energy storage systems.
- Industrial DC drives.
- Power converters and rectifiers.
- Renewable energy systems.
- UPS and critical power equipment.
- Industrial semiconductor protection.
