Why Choose the Mersen L300551 Protistor® High-Speed Fuse?
The Mersen L300551, catalogue number PC71UD11C500D1A, is a Protistor® Size 71 square body high-speed semiconductor fuse engineered to provide outstanding protection for high-power semiconductor equipment. Featuring an ultra-fast aR operating characteristic, it is specifically designed to protect IGBTs, thyristors, diodes and other sensitive semiconductor devices against damaging short-circuit currents.
Designed for demanding industrial applications, the L300551 combines low let-through energy with a high interrupting capacity to minimise semiconductor damage during fault conditions. Precision die-cut fuse elements embedded in solidified sand help control arcing characteristics while silver-plated contacts and non-magnetic hardware ensure dependable long-term performance.
With a 500 A current rating, 1100 V AC IEC and 1200 V AC UL voltage ratings, plus DIN 110 blade terminals and an integrated striker indicator, the Mersen L300551 is ideally suited to large industrial drives, converters, UPS systems, renewable energy equipment and other high-power semiconductor applications.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 500 A current rating for demanding industrial applications.
- 1100 V AC IEC / 1200 V AC UL voltage capability.
- Protects IGBTs, thyristors, diodes and other semiconductor devices.
- Low I²t characteristics help minimise semiconductor damage.
- DIN 110 blade terminals for secure installation.
- Integrated striker supports remote fuse indication.
Key Features
- Mersen Protistor® Size 71 series.
- Catalogue number: PC71UD11C500D1A.
- 500 A rated current.
- 1100 V AC IEC / 1200 V AC UL rated voltage.
- aR ultra-fast operating characteristic.
- DIN 110 blade terminals.
- Integrated low-voltage striker indicator.
- Silver-plated contact surfaces.
- Square body ceramic construction.
High-Voltage Semiconductor Protection
Protistor® high-speed semiconductor fuses are specifically developed to interrupt extremely high fault currents before expensive semiconductor devices suffer catastrophic damage. Their low energy let-through characteristics help maximise equipment availability while reducing maintenance costs across demanding industrial power conversion systems.
The robust square body construction, precision fuse elements and integrated striker indicator make the Mersen L300551 an excellent choice for engineers specifying reliable protection for high-voltage semiconductor equipment.
Typical Applications
- High-power variable speed drives.
- Industrial power converters.
- IGBT and thyristor protection.
- Large UPS systems.
- Renewable energy inverters.
- Industrial rectifiers.
- Power electronic equipment.
