Why Choose the Mersen H089500 Protistor® High-Speed Fuse?
The Mersen H089500 is a high-performance Protistor® cylindrical semiconductor fuse designed to protect sensitive power electronic components in demanding high-voltage DC systems. Rated at 50 A and 1000 V DC, it provides rapid fault interruption to help minimise thermal and electrical damage to semiconductor devices during short-circuit conditions.
Part of the Mersen Protistor® 36 × 127 mm gR (gRB) series, the H089500 offers low I²t performance, reduced power losses and dependable operation at elevated temperatures. These characteristics make it particularly suitable for modern DC equipment where conventional protective devices may not respond quickly enough to protect valuable semiconductor components.
The fuse incorporates an integrated striker indicator and provides a maximum rated breaking capacity of 100 kA DC. Its robust ceramic body, silver-plated copper ferrule terminals and clip-mounted format make it suitable for railway power circuits, auxiliary systems, industrial converters and other critical DC power applications.
Key Advantages
- High-speed gR semiconductor protection characteristic.
- 50 A rated current for demanding power electronic circuits.
- 1000 V DC voltage rating for high-voltage DC systems.
- 100 kA DC breaking capacity for dependable fault interruption.
- Low I²t performance helps minimise damage to protected components.
- Integrated striker provides clear fuse-operation indication.
Key Features
- Mersen Protistor® high-speed fuse series.
- 50 A rated current.
- 1000 V DC rated operating voltage.
- gR operating class with gRB design characteristics.
- 36 × 127 mm cylindrical fuse format.
- Integrated striker indication mechanism.
- Clip mounting for compatible cylindrical fuse holders.
- Silver-plated copper ferrule terminals.
- Durable ceramic insulating body.
- RoHS, REACH and UKCA compliant.
High-Speed Protection for Critical DC Equipment
Power semiconductor components can be permanently damaged by short-circuit energy before conventional protective devices have time to respond. The Mersen H089500 is engineered to interrupt high fault currents rapidly, reducing the thermal and electrical stress imposed on diodes, thyristors, IGBTs, rectifiers and other sensitive semiconductor assemblies.
Its high breaking capacity, low let-through energy and integrated striker make it particularly suitable for railway and industrial power systems. By limiting fault energy and providing clear operating indication, the fuse helps improve equipment reliability, simplify maintenance and extend the service life of valuable power electronic components.
Typical Applications
- Railway power and auxiliary circuits.
- Industrial DC power converters.
- Traction and transportation equipment.
- High-voltage rectifiers and inverters.
- Battery energy storage systems.
- DC distribution and power conversion equipment.
- Protection of diodes, thyristors, IGBTs and semiconductor modules.
