Why Choose the Mersen K300665 High-Speed Semiconductor Fuse?
The Mersen K300665 is a premium Protistor® square body high-speed semiconductor fuse engineered to provide ultra-fast protection for sensitive power electronic devices. Designed for demanding industrial applications, it safeguards IGBTs, thyristors, diodes, inverters and power conversion equipment against damaging short circuits whilst minimising fault energy and equipment downtime.
Part of the renowned Mersen Protistor® Size 71 aR series, the K300665 is designed for modern industrial drive systems, renewable energy installations, UPS equipment and heavy-duty automation applications. Its ceramic square body construction, silver-plated slotted blade terminals and integrated striker indicator provide dependable long-term performance in demanding electrical environments.
With a 400 A current rating, 1250 V AC IEC / 1300 V AC UL voltage rating and 126 kA breaking capacity, the K300665 delivers exceptional semiconductor protection for high-power industrial equipment.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 400 A current rating for demanding industrial power applications.
- 1250 V AC IEC / 1300 V AC UL voltage capability.
- 126 kA breaking capacity for outstanding fault protection.
- Integrated striker indicator enables rapid fault identification.
- Silver-plated slotted blade terminals ensure excellent electrical conductivity.
- Robust ceramic construction for reliable long-term service.
Key Features
- Mersen Protistor® Size 71 aR series.
- 400 A rated current.
- 1250 V AC IEC / 1300 V AC UL rated voltage.
- Ultra-fast aR operating characteristic.
- 126 kA AC breaking capacity.
- Integrated striker indication.
- Slotted blade terminals with silver-plated contacts.
- Square ceramic body construction.
- Designed for semiconductor protection.
Reliable Protection for High-Power Electronics
High-speed semiconductor fuses are specifically designed to protect expensive power electronic devices by interrupting short-circuit currents before damaging thermal energy can reach sensitive semiconductor components. Their ultra-fast operation helps improve equipment reliability whilst reducing maintenance costs and production downtime.
The Mersen Protistor® range is trusted globally by machine builders, panel manufacturers and industrial engineers for protecting variable frequency drives, UPS systems, renewable energy converters and industrial power supplies.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial inverters and converters.
- Protection of IGBT, thyristor and diode modules.
- UPS systems.
- Renewable energy power conversion equipment.
- Industrial automation and motor control panels.
- High-power semiconductor protection circuits.
