Why Choose the Mersen P300508 Protistor® High-Speed Fuse?
The Mersen P300508 is a premium Protistor® Size 73 high-speed semiconductor fuse designed to provide ultra-fast protection for sensitive power electronic equipment. Engineered for demanding industrial applications, it safeguards diodes, thyristors, IGBTs and other semiconductor devices against damaging short-circuit and overcurrent conditions while helping maximise system reliability and minimise downtime.
As part of the advanced Mersen Protistor® Size 73 series, the P300508 delivers high interrupting capacity with exceptionally low let-through energy. Its square ceramic body, silver-plated contacts and integrated striker indicator make it an excellent choice for variable speed drives, power converters, UPS systems, renewable energy equipment and industrial automation applications.
Rated at 550 A with a 1250 V AC IEC / 1300 V AC UL voltage rating, the P300508 features flush ends with metric threaded terminals for secure installation in high-power industrial electrical systems requiring dependable semiconductor protection.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 550 A current rating for high-power industrial applications.
- 1250 V AC IEC / 1300 V AC UL voltage rating.
- Protects IGBTs, thyristors, diodes and other semiconductor devices.
- High 126 kA breaking capacity.
- Integrated striker indicator for simplified maintenance and monitoring.
Key Features
- Mersen Protistor® Size 73 series.
- Catalogue number: PC73UD13C550TF.
- 550 A rated current.
- 1250 V AC IEC / 1300 V AC UL operating voltage.
- aR ultra-fast semiconductor protection characteristic.
- Flush ends with metric threaded terminals.
- Integrated striker indicator.
- Silver-plated contacts with ceramic square body construction.
Reliable Protection for High-Power Electronics
High-speed semiconductor fuses are specifically designed to interrupt fault currents before expensive power electronic components can be damaged. The Mersen Protistor® range offers low I²t values and rapid fault clearance, helping extend equipment life while reducing maintenance costs and production downtime.
The P300508 is widely specified for protecting high-power converters, industrial drives, renewable energy systems, UPS installations and other demanding power conversion equipment operating at elevated voltages.
Typical Applications
- High-power variable speed drives.
- Industrial power converters.
- Renewable energy inverter systems.
- Uninterruptible power supplies (UPS).
- Traction and heavy industrial power electronics.
- Industrial automation and power distribution equipment.
