Why Choose the Mersen Z300034 Protistor® High-Speed Fuse?
The Mersen Z300034 (A070UD31KI550) is a premium square body high-speed semiconductor fuse designed to provide outstanding protection for sensitive power electronic equipment. Part of the trusted Mersen Protistor® Size 31 series, this ultra-fast acting aR fuse protects IGBTs, thyristors, diodes and other semiconductor devices used in industrial power conversion systems.
Designed for demanding industrial applications, the Z300034 delivers excellent current limitation and low let-through energy, helping to minimise damage during fault conditions while maximising equipment uptime. Its ceramic square body construction, silver-plated contacts and integrated striker provide dependable performance and easy status indication in critical power systems.
With a rated current of 550 A and a 690 V AC IEC / 700 V AC UL voltage rating, the Mersen Z300034 is ideal for industrial drives, UPS systems, converters, renewable energy equipment and other applications where reliable semiconductor protection is essential.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 550 A current rating for demanding industrial applications.
- 690 V AC IEC / 700 V AC UL voltage capability.
- Protects IGBTs, thyristors, diodes and power semiconductor modules.
- Integrated striker indication for remote monitoring.
- Low I²t characteristics help minimise damage to valuable power electronics.
Key Features
- Mersen Protistor® Size 31 series.
- Catalogue number: A070UD31KI550.
- 550 A rated current.
- 690 V AC IEC / 700 V AC UL voltage rating.
- Ultra-fast aR operating characteristic.
- Short slotted blade terminals.
- Integrated striker for fuse operation indication.
- Ceramic body with silver-plated non-magnetic contact hardware.
Reliable Protection for Power Electronics
High-speed semiconductor fuses are engineered to interrupt fault currents extremely quickly, limiting thermal and mechanical stress on sensitive semiconductor devices. This helps maximise equipment reliability while reducing repair costs and production downtime.
The Mersen Protistor® Size 31 range is widely specified by OEMs, panel builders and industrial engineers for protecting converters, motor drives, UPS equipment and renewable energy systems where dependable semiconductor protection is essential.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor control equipment.
- Power converters and rectifiers.
- UPS and backup power systems.
- Renewable energy inverters.
- Industrial automation and power distribution systems.
