Why Choose the Mersen L079429 High-Speed Semiconductor Fuse?
The Mersen L079429 (D72SG120V200QF) is a Protistor® Size 72 square body high-speed semiconductor fuse designed to provide exceptional protection for power semiconductors, railway traction equipment, battery energy storage systems and high-power DC circuits. Engineered specifically for demanding DC applications, it delivers rapid fault interruption while minimising damage to sensitive electronic components.
Rated at 200 A and 1200 V DC (IEC), the fuse features an aR operating characteristic for semiconductor short-circuit protection, an integrated striker indicator for remote status indication and robust silver-plated copper L-bracket terminals for secure bolted installation. Its low I²t characteristics and low power losses help maximise equipment protection and operational reliability.
As part of the Mersen Protistor® semiconductor protection range, the L079429 is optimised for modern power conversion equipment operating at elevated temperatures, offering outstanding current limitation and long service life in demanding industrial environments.
Key Advantages
- High-speed aR semiconductor protection for DC power electronics.
- 200 A current rating and 1200 V DC IEC voltage rating.
- Extremely low I²t to minimise semiconductor damage.
- 100 kA DC breaking capacity for high fault-current interruption.
- Integrated striker indicator for simplified maintenance.
- Silver-plated copper L-bracket terminals provide secure electrical connections.
Key Features
- Mersen Protistor® Size 72 semiconductor fuse.
- Manufacturer reference: L079429.
- Catalogue number: D72SG120V200QF.
- Square body ceramic fuse construction.
- Bolted mounting arrangement.
- Integrated striker indication system.
- High-speed DC semiconductor protection.
- RoHS compliant.
Reliable Protection for High-Power DC Systems
High-speed semiconductor fuses are specifically engineered to protect sensitive power electronic devices including IGBTs, diodes, thyristors and converters. Their extremely fast fault-clearing performance limits the energy passing into protected devices, reducing repair costs and improving overall system reliability.
The Mersen Protistor® range is widely used in railway traction, renewable energy installations, battery storage systems, industrial converters and EV charging infrastructure where dependable semiconductor protection is essential.
Typical Applications
- Railway traction systems.
- Battery energy storage systems (BESS).
- Industrial DC converters.
- Renewable energy power conversion.
- Electric vehicle charging infrastructure.
- Protection of high-power semiconductor devices.
