Why Choose the Mersen H079449 High-Speed Fuse?
The Mersen H079449 (D272SG120V840QF) is a high-performance Protistor® square body semiconductor fuse engineered to provide rapid and reliable protection for power semiconductors, railway traction equipment and high-power DC systems. Designed for demanding industrial applications, this high-speed fuse delivers exceptional fault current limitation while helping protect valuable electronic components from catastrophic short circuits.
Part of the advanced Mersen Protistor® Size 2x72 aR 1200 VDC series, the H079449 is specifically developed for modern DC power equipment operating at elevated temperatures. Its low I²t characteristics, reduced power losses and long service life make it an excellent choice for railway applications, energy storage systems, EV charging infrastructure and industrial power conversion equipment.
With a 840 A current rating, 1200 V DC IEC voltage rating and aR operating class, the H079449 delivers partial-range semiconductor protection for high-performance electronic power systems. The integrated striker indicator enables quick fuse status identification, simplifying maintenance and reducing system downtime.
Key Advantages
- High-speed semiconductor protection fuse for demanding DC applications.
- 840 A current rating for high-power industrial systems.
- 1200 V DC IEC voltage rating for modern power electronics.
- aR operating class specifically designed for semiconductor protection.
- Integrated striker indicator for simplified maintenance.
- Low I²t and reduced power loss help minimise damage during fault conditions.
Key Features
- Mersen Protistor® Size 2x72 series.
- Square body high-speed semiconductor fuse.
- 840 A rated current.
- 1200 V DC IEC rated voltage.
- aR semiconductor protection characteristic.
- Integrated striker indication system.
- Bolted mounting with copper L-bracket terminals.
- Designed for railway traction, power conversion and energy storage applications.
Reliable Protection for High-Power DC Systems
High-speed semiconductor fuses protect sensitive power electronic devices by rapidly interrupting high fault currents before they can damage expensive components. Their low let-through energy helps improve system reliability while reducing repair costs and operational downtime.
The Mersen Protistor® range is widely used throughout railway traction systems, industrial converters, battery energy storage, renewable energy installations and EV charging infrastructure where dependable semiconductor protection is essential for continuous operation.
Typical Applications
- Railway traction and auxiliary power systems.
- Industrial DC power converters.
- Battery energy storage systems.
- Electric vehicle charging infrastructure.
- Renewable energy power conversion equipment.
- High-power semiconductor protection.
