Why Choose the Mersen L300252 Protistor® High-Speed Fuse?
The Mersen L300252, catalogue number PC33UD69V800A, is a Protistor® Size 33 square body high-speed semiconductor fuse engineered to protect sensitive power electronic equipment against high fault currents. Its ultra-fast aR operating characteristic provides dependable short-circuit protection for IGBTs, thyristors, diodes and other semiconductor devices used in industrial power conversion systems.
Designed for demanding industrial environments, the L300252 combines a high interrupting capacity with low let-through energy to minimise semiconductor damage during fault conditions. The fuse incorporates DIN 80 blade terminals with an integrated striker indicator, allowing optional remote fuse indication via a compatible microswitch.
With an 800 A current rating, 690 V AC IEC and 700 V AC UL voltage ratings, the Mersen L300252 is ideally suited for variable speed drives, UPS systems, converters, renewable energy equipment and other industrial power electronic applications requiring reliable semiconductor protection.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 800 A current rating for demanding industrial applications.
- 690 V AC IEC / 700 V AC UL voltage capability.
- Protects IGBTs, thyristors, diodes and other semiconductor devices.
- Integrated striker indicator for remote status indication.
- High interrupting capacity with low I²t energy.
Key Features
- Mersen Protistor® Size 33 series.
- Catalogue number: PC33UD69V800A.
- 800 A rated current.
- 690 V AC IEC / 700 V AC UL rated voltage.
- aR ultra-fast operating characteristic.
- DIN 80 blade terminals.
- Silver-plated contact surfaces.
- Integrated striker indication.
- Square body bolted construction.
Advanced Semiconductor Protection
Protistor® semiconductor fuses are specifically designed to interrupt extremely high fault currents before they can damage expensive semiconductor devices. Their low let-through energy and rapid fault-clearing characteristics help maximise equipment availability while reducing repair costs in industrial power conversion systems.
The robust square body construction, silver-plated terminals and precision fuse elements provide dependable long-term performance across demanding industrial automation, renewable energy and power conversion applications.
Typical Applications
- Variable speed motor drives.
- Industrial power converters.
- IGBT and thyristor protection.
- UPS and backup power systems.
- Renewable energy inverters.
- Industrial power electronics and automation equipment.
