Why Choose the Mersen N079431 High-Speed Semiconductor Fuse?
The Mersen N079431 (D72SG120V315QF) is a Protistor® Size 72 square body high-speed semiconductor fuse developed to provide fast, dependable protection for railway power circuits, auxiliary systems and other demanding high-voltage DC power electronics. Its rapid fault-clearing performance helps minimise the energy transferred to sensitive semiconductor components during short-circuit conditions.
Rated at 315 A and 1200 V DC, the N079431 features an aR operating characteristic specifically designed for semiconductor short-circuit protection. Its low I²t performance, reduced power losses and ceramic square body construction make it suitable for modern DC equipment operating under elevated temperatures and demanding electrical conditions.
The fuse incorporates silver-plated copper L-bracket terminals for secure bolted installation and an integrated striker indication system for quick identification after fuse operation. With a maximum DC breaking capacity of 100 kA, the Mersen N079431 provides robust protection for critical power conversion and transportation equipment.
Key Advantages
- High-speed aR semiconductor protection for demanding DC systems.
- 315 A current rating with a 1200 V DC IEC voltage rating.
- 100 kA DC breaking capacity for reliable fault interruption.
- Low clearing I²t helps minimise damage to protected semiconductor components.
- Integrated striker indicator simplifies inspection and maintenance.
- Designed for railway power, auxiliary circuits and industrial power conversion.
Key Features
- Mersen Protistor® Size 72 high-speed fuse.
- Manufacturer reference: N079431.
- Catalogue number: D72SG120V315QF.
- Square body ceramic construction.
- Bolted mounting configuration.
- Silver-plated copper L-bracket terminals.
- Integrated striker indication system.
- RoHS compliant.
Reliable Protection for High-Power DC Electronics
High-speed semiconductor fuses are designed to interrupt fault currents significantly faster than conventional industrial fuses. This rapid response limits the thermal and electrical energy reaching IGBTs, thyristors, diodes and other sensitive power electronic components, helping reduce equipment damage and operational downtime.
The Mersen Protistor® DC fuse range is engineered for equipment operating at elevated temperatures, with low watt loss and low I²t characteristics supporting dependable protection and a long operational life. Correct coordination with the protected semiconductor and system design remains essential.
Typical Applications
- Railway traction power systems.
- Railway auxiliary electrical circuits.
- Industrial DC converters and inverters.
- Battery energy storage systems.
- Renewable energy power conversion equipment.
- Protection of high-power semiconductor devices.
