Why Choose the Mersen B090437 High-Speed Fuse?
The Mersen B090437 (D122GC75V250TF) is a high-performance Protistor® square body semiconductor fuse engineered to provide fast and reliable protection for power semiconductors, converters and DC power systems. Designed for demanding industrial applications, this high-speed fuse delivers exceptional fault current limitation while helping minimise damage to sensitive electronic components.
Part of the trusted Mersen Protistor® Size 122 gR 750 VDC series, the B090437 is optimised for railway traction systems, DC power equipment, battery energy storage, power conversion systems and other applications where rapid protection of semiconductor devices is essential. Its robust square body construction, low power loss and high breaking performance ensure dependable long-term operation.
With a 250 A current rating, 750 V DC rating and gR operating class, this fuse provides full-range semiconductor protection. The integrated striker indicator enables rapid fuse status identification, reducing maintenance time and improving system availability.
Key Advantages
- High-speed semiconductor protection fuse for critical DC applications.
- 250 A current rating for demanding industrial power systems.
- 750 V DC voltage rating suitable for modern power conversion equipment.
- gR full-range protection for semiconductor devices.
- Integrated striker indicator for fast maintenance identification.
- Low I²t and low power loss help minimise damage during fault conditions.
Key Features
- Mersen Protistor® Size 122 series.
- Square body high-speed fuse.
- 250 A rated current.
- 750 V DC IEC rated voltage.
- gR operating class for semiconductor protection.
- Flush end connections with metric threads.
- Integrated striker for blown fuse indication.
- Designed for railway, industrial and power electronic applications.
Reliable Protection for Power Electronics
High-speed semiconductor fuses are specifically engineered to protect sensitive power electronic components against damaging short circuits. Their low let-through energy and rapid fault clearing characteristics help reduce equipment damage, minimise downtime and improve overall system reliability.
The Mersen Protistor® range is widely specified by equipment manufacturers for applications requiring dependable protection of rectifiers, inverters, converters, battery systems and industrial power electronics operating under demanding electrical conditions.
Typical Applications
- Railway traction and auxiliary power systems.
- Industrial power converters.
- Semiconductor protection.
- Battery energy storage systems.
- Variable speed drives and inverters.
- Industrial DC power distribution equipment.
