Why Choose the Mersen K300550 Protistor® High-Speed Fuse?
The Mersen K300550 (PC71UD13C450D1A) is a premium square body high-speed semiconductor fuse from the Protistor® Size 71 series, engineered to provide superior protection for modern power electronic equipment. Featuring an ultra-fast aR operating characteristic, it is specifically designed to protect IGBTs, thyristors, diodes and other semiconductor devices against damaging short-circuit currents.
Rated at 450 A with a 1250 V AC IEC / 1300 V AC UL voltage rating, the K300550 is suitable for high-voltage industrial applications including medium-voltage drives, renewable energy converters, UPS systems and industrial power converters. Its robust ceramic body, silver-plated contacts and solidified silica sand construction deliver excellent current limitation, very low let-through energy and dependable long-term performance.
The fuse is supplied with DIN 110 blade terminals and an integrated striker indicator, allowing remote indication when used with a compatible microswitch. Its high interrupting capacity and low I²t characteristics help minimise semiconductor damage while reducing costly equipment downtime.
Key Advantages
- Ultra-fast aR semiconductor protection.
- 450 A current rating.
- 1250 V AC IEC / 1300 V AC UL voltage rating.
- Protects IGBTs, thyristors and power diodes.
- DIN 110 blade terminals for secure installation.
- Integrated striker indicator for remote status monitoring.
- Very low I²t for enhanced semiconductor protection.
- High interrupting capacity for demanding industrial applications.
Key Features
- Manufacturer: Mersen.
- Protistor® Size 71 semiconductor fuse.
- Catalogue number: PC71UD13C450D1A.
- 450 A current rating.
- 1250 V AC IEC rating.
- 1300 V AC UL rating.
- aR ultra-fast operating characteristic.
- DIN 110 blade terminals.
- Integrated striker indicator.
- Silver-plated contacts.
- Ceramic body with solidified sand construction.
Reliable High-Voltage Semiconductor Protection
The Protistor® Size 71 range is designed for demanding high-voltage power conversion equipment operating up to 1250 V AC IEC / 1300 V AC UL. These ultra-fast fuses provide exceptional protection by limiting fault energy before semiconductor devices can be damaged, helping improve equipment reliability while reducing maintenance costs and production downtime.
Typical Applications
- Medium-voltage variable speed drives.
- Industrial power converters.
- Renewable energy inverters.
- Wind power converters.
- Large UPS installations.
- Industrial rectifiers.
- Power quality equipment.
- High-power motor control systems.
