Why Choose the Mersen M079430 High-Speed Semiconductor Fuse?
The Mersen M079430 (D72SG120V250QF) is a Protistor® Size 72 square body high-speed semiconductor fuse engineered to provide rapid and reliable protection for power semiconductors, railway traction equipment, battery energy storage systems and high-power DC installations. Developed for demanding DC applications, it delivers exceptional fault current limitation while helping protect valuable electronic components from catastrophic short circuits.
Rated at 250 A with a 1200 V DC (IEC) voltage rating, the M079430 features an aR operating characteristic, integrated striker indicator and robust L-bracket bolted terminals. Its low I²t characteristics, reduced power losses and high breaking capacity help maximise equipment protection and minimise downtime in demanding industrial environments.
Part of the Mersen Protistor® semiconductor protection range, the M079430 is specifically designed for modern power conversion equipment operating at elevated temperatures, making it ideal for railway auxiliary circuits, industrial converters, renewable energy systems and EV charging infrastructure.
Key Advantages
- High-speed aR semiconductor protection for sensitive power electronics.
- 250 A current rating with 1200 V DC IEC operation.
- 100 kA DC breaking capacity for dependable fault interruption.
- Low I²t helps minimise semiconductor damage during short circuits.
- Integrated striker indicator for rapid fuse status identification.
- Designed for demanding railway, energy storage and industrial DC applications.
Key Features
- Mersen Protistor® Size 72 semiconductor fuse.
- Manufacturer reference: M079430.
- Catalogue number: D72SG120V250QF.
- Square body ceramic fuse construction.
- Bolted mounting with L-bracket terminals.
- Integrated striker indication.
- High-speed DC semiconductor protection.
- RoHS compliant.
Reliable Protection for High-Power DC Systems
High-speed semiconductor fuses are specifically engineered to protect IGBTs, diodes, thyristors and other sensitive power electronic devices. Their extremely fast fault-clearing performance limits the energy passing into protected components, helping to reduce repair costs, improve equipment reliability and minimise operational downtime.
The Mersen Protistor® range is widely used in railway traction, industrial converters, renewable energy installations, battery energy storage systems and EV charging infrastructure where dependable semiconductor protection is essential.
Typical Applications
- Railway traction and auxiliary power systems.
- Battery energy storage systems (BESS).
- Industrial DC converters.
- Renewable energy power conversion.
- Electric vehicle charging infrastructure.
- Protection of high-power semiconductor devices.
