Why Choose the Mersen G089499 Protistor® High-Speed Fuse?
The Mersen G089499 is a high-performance Protistor® cylindrical semiconductor fuse designed to protect sensitive power electronic components in demanding DC systems. Rated at 40 A and 1000 V DC, it provides rapid fault interruption to help reduce the thermal and electrical energy transferred to semiconductor devices during short-circuit conditions.
Part of the Mersen Protistor® 36 × 127 mm gR series, the G089499 has been developed for modern DC equipment that requires lower I²t performance, reduced watt losses and dependable operation at elevated temperatures. Its full-range semiconductor protection characteristic makes it suitable for safeguarding valuable components within railway, industrial and power conversion equipment.
The fuse features an integrated striker indicator and a maximum rated breaking capacity of 100 kA DC. Its robust cylindrical construction and clip-mounted format support installation in compatible fuse holders within electrical cabinets, railway auxiliary circuits and industrial power electronic systems.
Key Advantages
- High-speed gR semiconductor protection characteristic.
- 40 A rated current for demanding power electronic circuits.
- 1000 V DC voltage rating for high-voltage DC equipment.
- 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.
- 40 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.
- Low let-through energy during short-circuit conditions.
- Reduced power losses and long operational life.
- RoHS compliant.
High-Speed Protection for Critical DC Equipment
Power semiconductor components can be damaged by fault energy before conventional protective devices have time to operate. The Mersen G089499 is engineered to interrupt high fault currents rapidly, helping limit the stress imposed on diodes, thyristors, IGBTs, rectifiers and other sensitive semiconductor assemblies.
Its high breaking capacity, low let-through energy and striker indication make it particularly suitable for railway power and auxiliary circuits. The fuse can also be used within industrial converters and other DC power systems where reliable semiconductor protection, efficient operation and reduced equipment downtime are essential.
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.
