Why Choose the Mersen K300573 High-Speed Semiconductor Fuse?
The Mersen K300573 is a high-performance Protistor® square body semiconductor protection fuse engineered to provide ultra-fast protection for sensitive power electronic components. Designed for demanding industrial applications, this high-speed fuse safeguards IGBTs, thyristors, diodes, inverters and power conversion equipment against damaging short circuits while minimising energy let-through.
Part of the trusted Mersen Protistor® Size 73 aR series, the K300573 delivers exceptional reliability in industrial automation, renewable energy systems, motor drives and power conversion equipment. Its square body construction, silver-plated contacts and integrated striker indicator provide dependable performance whilst simplifying maintenance and fault detection.
With a 900 A current rating, 1000 V AC IEC / 1100 V AC UL voltage rating and 167 kA breaking capacity, the K300573 is designed for high-power semiconductor protection where fast fault clearance and dependable operation are essential.
Key Advantages
- Ultra-fast aR semiconductor protection fuse for sensitive power electronics.
- 900 A current rating for demanding industrial applications.
- 1000 V AC IEC / 1100 V AC UL voltage capability.
- High 167 kA breaking capacity for enhanced equipment protection.
- Integrated striker indicator enables rapid fuse status identification.
- Silver-plated DIN 110 blade terminals ensure reliable electrical connections.
- Robust ceramic square body construction for long service life.
Key Features
- Mersen Protistor® Size 73 aR series.
- 900 A rated current.
- 1000 V AC IEC / 1100 V AC UL rated voltage.
- Ultra-fast aR operating characteristic.
- 167 kA AC breaking capacity.
- Integrated striker indication system.
- DIN 110 silver-plated blade terminals.
- Bolted mounting configuration.
- Ceramic insulated square body construction.
Reliable Protection for Power Electronics
High-speed semiconductor fuses are specifically designed to protect expensive power electronic devices from catastrophic damage caused by short circuits. Their ultra-fast operation limits fault energy before it reaches sensitive semiconductor components, helping minimise downtime and costly equipment repairs.
The Mersen Protistor® range is trusted throughout industry for protecting variable frequency drives, UPS systems, renewable energy converters, industrial power supplies and other high-power electronic installations where rapid fault interruption is essential.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial inverters and converters.
- Protection of IGBT and thyristor modules.
- UPS and power supply equipment.
- Renewable energy power conversion systems.
- Industrial automation and motor control panels.
- High-power semiconductor protection circuits.
