Why Choose the Mersen L300206 Protistor® High-Speed Fuse?
The Mersen L300206, catalogue number A070UD32LI500, is a high-performance Protistor® square body semiconductor fuse designed to protect sensitive power electronic equipment against damaging short-circuit currents. Its ultra-fast aR operating characteristic makes it suitable for safeguarding IGBTs, thyristors, diodes and other semiconductor devices.
Part of the Mersen Protistor® Size 32 range, the L300206 combines low let-through energy with a high interrupting capacity. The fuse uses precision die-cut elements embedded in solidified sand to control arcing, reduce I²t and provide rapid fault clearance in demanding industrial power conversion applications.
With a 500 A current rating, 690 V AC IEC rating and 700 V AC UL rating, the L300206 is suitable for industrial drives, converters, UPS equipment and renewable energy systems. Its long slotted blade terminals and integrated striker provide secure bolted installation and clear fuse-operation indication.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 500 A current rating for industrial power electronics.
- 690 V AC IEC and 700 V AC UL voltage ratings.
- Very low I²t helps reduce damage to sensitive semiconductors.
- High interrupting capacity for demanding fault conditions.
- Integrated striker indicator supports fault monitoring.
Key Features
- Mersen Protistor® Size 32 series.
- Catalogue number: A070UD32LI500.
- 500 A rated current.
- 690 V AC IEC / 700 V AC UL rated voltage.
- aR ultra-fast fuse characteristic.
- Long slotted blade terminal configuration.
- Silver-plated contact surfaces.
- Non-magnetic installation hardware.
- Integrated low-voltage striker indicator.
- Square ceramic body with bolted mounting.
Ultra-Fast Protection for Power Electronics
Semiconductor devices can be damaged by fault currents that rise too quickly for conventional industrial fuses to interrupt safely. The Mersen L300206 is engineered to operate rapidly and limit the thermal and electrical energy reaching protected components during a short circuit.
Its low I²t performance and current-limiting operation help protect expensive power conversion equipment while reducing the risk of extensive secondary damage. The robust ceramic square body, solidified sand filling and silver-plated contacts provide dependable performance in industrial environments with frequent load cycling.
Typical Applications
- Variable speed and variable frequency drives.
- Industrial rectifiers and power converters.
- IGBT, thyristor and diode protection.
- Uninterruptible power supply systems.
- Renewable energy inverters.
- Battery chargers and energy storage systems.
- Industrial heating and power control equipment.
- Machine automation and power electronic assemblies.
