Why Choose the Mersen F075744 Protistor® High-Speed Fuse?
The Mersen F075744, also identified by catalogue number FD20GB150V1T, is a high-speed cylindrical fuse developed for the protection of sensitive semiconductor devices and auxiliary DC circuits. Part of the Mersen Protistor® 20 × 127 mm gR series, it provides fast, full-range overcurrent protection in demanding high-voltage electrical systems.
This fuse combines a low let-through energy characteristic with rapid fault interruption, helping reduce the thermal and electrical stress placed on valuable power electronic components. Its gR operating class makes it suitable for protecting semiconductors against both overloads and short-circuit currents.
With a rated current of 1 A, a maximum IEC voltage rating of 1500 V DC and a 30 kA DC breaking capacity, the F075744 is particularly suited to auxiliary circuits, control equipment, measuring devices and monitoring systems. An integrated striker also supports local or remote fuse-operation indication when used with compatible fuse holders.
Key Advantages
- High-speed semiconductor protection fuse for demanding DC circuits.
- 1500 V DC voltage rating suitable for high-voltage applications.
- 1 A current rating for auxiliary, control and monitoring circuits.
- Fast, full-range gR fuse characteristic.
- Low I²t performance helps minimise damage to semiconductor components.
- Integrated striker indication supports efficient fault identification.
Key Features
- Mersen Protistor® high-speed fuse series.
- 1 A rated current.
- 1500 V DC IEC rated voltage.
- 30 kA DC breaking capacity.
- gR operating class with gRB construction.
- Compact 20 × 127 mm cylindrical format.
- Integrated striker for fuse-status indication.
- Ceramic body with silver-plated copper ferrule contacts.
Reliable Protection for High-Voltage DC Circuits
High-speed fuses such as the Mersen F075744 are engineered to interrupt damaging fault currents before excessive thermal energy reaches semiconductor devices. Their low I²t performance provides enhanced protection for components that may be damaged more quickly than conventional industrial fuses can respond.
The F075744 is specially developed for high-voltage DC applications and provides full-range protection for auxiliary circuits, control systems and measuring or monitoring equipment. Its current-limiting performance and strong cycling capability support reliable operation in industrial and transportation power systems.
Typical Applications
- Railway auxiliary power circuits.
- Industrial DC control systems.
- Measuring and monitoring equipment.
- Power converters and rectifiers.
- Battery energy storage equipment.
- Semiconductor and power electronic protection.
