Why Choose the Mersen L300505 Protistor® High-Speed Fuse?
The Mersen L300505, catalogue number PC73UD13C400TF, is a Protistor® Size 73 square body high-speed semiconductor fuse engineered to provide exceptional protection for modern power electronic equipment. Featuring an ultra-fast aR operating characteristic, it protects IGBTs, thyristors, diodes and other semiconductor devices against damaging short-circuit currents while minimising let-through energy.
Designed for demanding industrial applications, the L300505 combines high breaking capacity with precision fuse elements embedded in solidified sand to deliver low I²t performance and reliable fault interruption. The fuse features TTF threaded terminals (M12), silver-plated contact surfaces and an integrated striker for optional remote indication.
Rated at 400 A, with a 1250 V AC IEC and 1300 V AC UL voltage rating, the Mersen L300505 is ideal for heavy-duty industrial converters, large variable speed drives, renewable energy systems and other high-power semiconductor applications.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 400 A current rating for high-power industrial applications.
- 1250 V AC IEC / 1300 V AC UL voltage capability.
- Low I²t characteristics reduce semiconductor damage.
- High 126 kA breaking capacity.
- Integrated striker for optional remote indication.
- Silver-plated contacts for dependable long-term performance.
Key Features
- Mersen Protistor® Size 73 series.
- Catalogue number: PC73UD13C400TF.
- 400 A rated current.
- 1250 V AC IEC / 1300 V AC UL rated voltage.
- aR ultra-fast operating characteristic.
- M12 threaded terminal configuration (TTF).
- Integrated low-voltage striker indicator.
- Square body bolted construction.
- Silver-plated contact surfaces.
Designed for High-Power Semiconductor Protection
Protistor® high-speed semiconductor fuses are engineered specifically to interrupt high fault currents before expensive semiconductor devices suffer catastrophic damage. Their low energy let-through performance helps maximise equipment reliability while reducing downtime and maintenance costs.
The robust square body construction, precision fuse elements, silver-plated contacts and threaded terminal arrangement make the Mersen L300505 suitable for demanding industrial environments requiring dependable high-voltage semiconductor protection.
Typical Applications
- High-power variable speed drives.
- Industrial power converters.
- Large UPS systems.
- Renewable energy inverters.
- Traction and transportation power electronics.
- Industrial rectifiers.
- IGBT, thyristor and diode protection.
