Why Choose the Mersen G301858 Protistor® High-Speed Fuse?
The Mersen G301858 (PC71GB69V500EF) is a premium square body high-speed semiconductor fuse from the Protistor® Size 71 gR series, engineered to provide full-range protection for modern power electronic equipment. Designed for demanding industrial applications, it protects sensitive semiconductor devices including IGBTs, thyristors, SCRs and power diodes against both overloads and short-circuit faults.
Manufactured using precision die-cut silver fuse elements embedded in solidified sand, the fuse delivers outstanding current limitation, low let-through energy and high interrupting capacity. Silver-plated contact surfaces and non-magnetic hardware provide dependable long-term performance, while the bolted EF terminal design ensures secure installation within industrial power systems.
With a 500 A current rating, 690 V AC IEC voltage rating and a gR full-range operating characteristic, the G301858 is ideally suited for industrial motor drives, UPS systems, renewable energy inverters, converters and other high-power semiconductor protection applications.
Key Advantages
- Full-range gR semiconductor protection fuse.
- 500 A current rating for demanding industrial applications.
- 690 V AC IEC rated voltage.
- Protects against both overloads and short-circuit faults.
- Excellent current limitation with low let-through energy.
- Robust square body construction for long service life.
Key Features
- Mersen Protistor® Size 71 gR series.
- Catalogue number: PC71GB69V500EF.
- 500 A rated current.
- 690 V AC IEC rated voltage.
- Square body ceramic fuse.
- EF bolted connection terminals.
- Silver-plated contacts with non-magnetic hardware.
- High interrupting capacity for industrial semiconductor protection.
Reliable Protection for Industrial Power Electronics
The Protistor® Size 71 gR range provides full-range semiconductor protection, safeguarding power electronic devices against both overload and short-circuit conditions. Its ultra-fast operation limits fault current and thermal energy, helping maximise equipment reliability while reducing maintenance costs and downtime.
The G301858 is widely used within industrial automation, renewable energy systems, UPS installations and power conversion equipment where dependable semiconductor protection is essential for safe operation.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- UPS and standby power systems.
- Renewable energy inverters.
- Power converters and rectifiers.
- Protection of IGBT, SCR, thyristor and diode modules.
