Why Choose the Mersen F300385 Protistor® High-Speed Fuse?
The Mersen F300385 (catalogue number A070UD31KI160) is a high-performance Protistor® square body semiconductor protection fuse engineered to provide rapid and reliable protection for sensitive power electronic devices. Designed specifically for safeguarding semiconductors such as IGBTs, thyristors, diodes and power conversion equipment, it delivers exceptional fault protection in demanding industrial applications.
As part of the trusted Mersen Protistor® Size 31 aR series, this ultra-fast acting fuse helps minimise damage caused by short circuits through its low let-through energy (I²t) characteristics and high breaking capacity. Its silver-plated contacts, robust square body construction and integrated striker provide dependable operation and simplified maintenance within industrial electrical systems.
Rated at 160 A with an operating voltage of 690 V AC (IEC) / 700 V AC (UL), the F300385 is ideally suited for protecting variable speed drives, UPS systems, soft starters, power converters and other semiconductor-based equipment requiring fast and reliable overcurrent protection.
Key Advantages
- Ultra-fast aR semiconductor protection fuse for sensitive electronic equipment.
- 160 A current rating for industrial power applications.
- 690 V AC IEC / 700 V AC UL voltage rating.
- High 200 kA breaking capacity for enhanced fault protection.
- Integrated striker indicator for simplified fuse monitoring.
- Silver-plated contacts ensure excellent conductivity and long service life.
- Protects IGBTs, SCRs, diodes and other semiconductor devices against short circuits.
Key Features
- Mersen Protistor® Size 31 aR series.
- 160 A rated current.
- 690 V AC (IEC) / 700 V AC (UL).
- Ultra-fast acting aR characteristic.
- Square body fuse with short slotted blade terminals.
- Integrated striker for remote indication or microswitch operation.
- Low I²t characteristics for semiconductor protection.
- Suitable for industrial power conversion equipment.
Designed for Advanced Semiconductor Protection
High-speed semiconductor fuses are designed to interrupt fault currents before sensitive electronic components can be damaged. Unlike conventional industrial fuses, the Mersen Protistor® series provides exceptionally fast operation with low let-through energy, helping extend the service life of costly power electronics.
The F300385 is widely used in industrial automation, renewable energy systems and power conversion equipment where dependable protection is essential for maintaining system reliability and minimising downtime.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- Power converters and inverters.
- UPS and power supply systems.
- Soft starters.
- Semiconductor protection for IGBTs, SCRs and diodes.
- Industrial automation and OEM equipment.
