Why Choose the Mersen M085249 High-Speed Semiconductor Fuse?
The Mersen M085249 (D122GC75V315TF) is a Protistor® Size 122 square body high-speed semiconductor fuse designed to deliver exceptional protection for power semiconductors, railway traction equipment and high-power DC applications. Engineered for demanding environments, it rapidly clears fault currents while minimising damage to sensitive semiconductor devices, improving system reliability and reducing downtime.
Rated at 315 A with a 750 V DC (IEC) voltage rating, this fuse features a gR operating characteristic, providing both overload and short-circuit protection for semiconductor devices. Its square body design incorporates flush metric threaded terminals and an integrated striker indicator for easy status monitoring and maintenance.
As part of the Mersen Protistor® DC semiconductor protection range, the M085249 is specifically developed for modern railway auxiliary circuits, industrial converters, battery energy storage systems and renewable energy installations operating under demanding DC conditions.
Key Advantages
- High-speed gR semiconductor protection for overload and short-circuit conditions.
- 315 A current rating with 750 V DC IEC operation.
- 100 kA DC breaking capacity for dependable fault interruption.
- Low I²t characteristics help minimise semiconductor damage.
- Integrated striker indicator for rapid fuse status identification.
- Designed for railway, industrial DC power conversion and energy storage applications.
Key Features
- Mersen Protistor® Size 122 semiconductor fuse.
- Manufacturer reference: M085249.
- Catalogue number: D122GC75V315TF.
- Square body ceramic fuse construction.
- Flush metric threaded terminals.
- Integrated striker indication.
- High-speed DC semiconductor protection.
- RoHS compliant.
Reliable Protection for High-Power DC Systems
High-speed semiconductor fuses are specifically designed to protect sensitive power electronic devices including IGBTs, diodes, thyristors and converters. Their extremely rapid fault-clearing performance limits the energy reaching protected components, helping reduce repair costs, improve equipment reliability and minimise operational downtime.
The Mersen Protistor® range is widely used in railway traction systems, battery energy storage installations, renewable energy equipment and industrial DC converters where dependable semiconductor protection is essential for continuous operation.
Typical Applications
- Railway traction and auxiliary power systems.
- Battery energy storage systems (BESS).
- Industrial DC converters.
- Renewable energy power conversion equipment.
- Electric vehicle charging infrastructure.
- Protection of high-power semiconductor devices.
