Why Choose the Mersen L300666 Protistor® High-Speed Fuse?
The Mersen L300666, catalogue number A130UD71LLI450, is a Protistor® Size 71 square body high-speed semiconductor fuse developed to provide advanced protection for modern power electronic equipment. With its ultra-fast aR operating characteristic, it safeguards IGBTs, thyristors, diodes and other semiconductor devices against damaging short-circuit currents while maintaining low let-through energy.
Designed for demanding industrial applications, the L300666 features long slotted blade (LLI) terminals with an integrated striker indicator, silver-plated contact surfaces and precision die-cut fuse elements embedded in solidified sand for dependable arc control, low I²t values and high interrupting performance.
Rated at 450 A, with 1250 V AC IEC and 1300 V AC UL voltage ratings, the Mersen L300666 is ideally suited for high-power drives, renewable energy converters, UPS systems, industrial rectifiers and other semiconductor-based power conversion equipment.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 450 A current rating.
- 1250 V AC IEC / 1300 V AC UL voltage capability.
- Low I²t characteristics minimise semiconductor damage.
- 126 kA AC breaking capacity.
- Long slotted blade (LLI) terminals for secure bolted installation.
- Integrated striker supports optional remote indication.
- Silver-plated contacts for long service life.
Key Features
- Mersen Protistor® Size 71 series.
- Catalogue number: A130UD71LLI450.
- 450 A rated current.
- 1250 V AC IEC / 1300 V AC UL.
- aR ultra-fast operating characteristic.
- Long slotted blade (LLI) terminals.
- Integrated striker indication.
- Square body ceramic construction.
- Silver-plated contact surfaces.
Designed for High-Power Semiconductor Protection
Protistor® semiconductor fuses are specifically engineered to interrupt extremely high fault currents before costly semiconductor devices are damaged. Their low energy let-through characteristics improve equipment reliability while reducing maintenance costs across demanding industrial power conversion systems.
The robust square body construction, silver-plated contacts, precision fuse elements and integrated striker indicator make the Mersen L300666 an ideal solution for protecting high-voltage drives, converters and renewable energy systems.
Typical Applications
- High-power variable speed drives.
- Industrial power converters.
- Renewable energy inverters.
- Large UPS systems.
- Industrial rectifiers.
- Traction power equipment.
- IGBT, thyristor and diode protection.
