Why Choose the Mersen X301343 Protistor® High-Speed Fuse?
The Mersen X301343 is a Protistor® Size 73 gR square body high-speed semiconductor fuse engineered to provide full-range protection for sensitive power semiconductor devices. Rated at 400 A and 690 V AC (IEC), it is designed to protect rectifiers, inverters, converters, motor drives and other industrial power electronic equipment against overloads and short-circuit faults.
Constructed using pure silver die-cut fuse elements embedded in solidified sand, the X301343 delivers exceptionally low I²t values, excellent arc suppression and high interrupting performance. Silver-plated contact surfaces, non-magnetic hardware and an integrated striker indicator provide reliable operation while simplifying maintenance and remote status indication.
The fuse features flush-end metric threaded terminals for secure bolted installation and forms part of Mersen's internationally recognised Protistor® semiconductor protection range, trusted across industrial automation, renewable energy, UPS systems and power conversion applications.
Key Advantages
- Full-range gR semiconductor protection.
- 400 A current rating.
- 690 V AC IEC voltage rating.
- 150 kA breaking capacity.
- Integrated striker indicator for fault indication.
- Silver-plated flush-end metric threaded terminals for dependable electrical connections.
Key Features
- Mersen Protistor® Size 73 series.
- Catalogue number PC73GB69V400TF.
- 400 A rated current.
- 690 V AC IEC rated voltage.
- gR full-range semiconductor protection.
- Square body bolted construction.
- Flush-end metric threaded terminals.
- Integrated striker indication system.
- Ceramic insulated body with silver-plated brass terminals.
Reliable Semiconductor Protection
Protistor® gR semiconductor fuses provide both overload and short-circuit protection for power semiconductor devices. Their ultra-fast operation minimises thermal stress on expensive components while helping maximise equipment reliability and reduce downtime.
The Mersen Protistor® range is widely specified for industrial drives, renewable energy systems, UPS equipment, converters, rectifiers and other high-power electronic installations where dependable semiconductor protection is essential.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- Power converters.
- Rectifier systems.
- UPS installations.
- Renewable energy inverters.
- Industrial automation equipment.
