Why Choose the Mersen L300528 Protistor® High-Speed Fuse?
The Mersen L300528, catalogue number A070UD30LI500, is a Protistor® Size 30 square body high-speed semiconductor fuse engineered to protect sensitive power electronic equipment from damaging short-circuit currents. Featuring an ultra-fast aR operating characteristic, it provides exceptional protection for IGBTs, thyristors, diodes and other semiconductor devices used in demanding industrial applications.
Designed for high-performance power conversion equipment, the L300528 combines low let-through energy with a high interrupting capacity to minimise semiconductor damage during fault conditions. The fuse features long slotted blade terminals (LI), silver-plated contacts and precision fuse elements embedded in solidified sand for dependable long-term operation.
With a 500 A current rating, 690 V AC IEC and 700 V AC UL voltage ratings, the Mersen L300528 is ideally suited to variable speed drives, industrial converters, UPS systems, renewable energy equipment and other semiconductor-based power electronics requiring reliable overcurrent protection.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 500 A current rating for demanding industrial applications.
- 690 V AC IEC / 700 V AC UL voltage capability.
- Low I²t characteristics help minimise semiconductor damage.
- High interrupting capacity for reliable fault protection.
- Long slotted blade terminals for secure bolted installation.
- Silver-plated contacts provide excellent conductivity and corrosion resistance.
Key Features
- Mersen Protistor® Size 30 series.
- Catalogue number: A070UD30LI500.
- 500 A rated current.
- 690 V AC IEC / 700 V AC UL rated voltage.
- aR ultra-fast operating characteristic.
- Long slotted blade (LI) terminal configuration.
- Silver-plated contact surfaces.
- Square body ceramic construction.
- Bolted installation.
Reliable Semiconductor Protection
Protistor® semiconductor fuses are specifically engineered to interrupt high fault currents before sensitive semiconductor devices suffer irreversible damage. Their ultra-fast response and low energy let-through characteristics help maximise equipment availability while reducing maintenance costs in industrial power conversion systems.
The Mersen L300528 is manufactured using precision die-cut fuse elements embedded in solidified sand to provide controlled arc extinction, low I²t performance and dependable protection across demanding industrial environments.
Typical Applications
- Variable speed motor drives.
- Industrial power converters.
- IGBT and thyristor protection.
- UPS and backup power systems.
- Renewable energy inverters.
- Battery energy storage systems.
- Industrial automation equipment.
