Why Choose the Mersen G301283 Protistor® High-Speed Fuse?
The Mersen G301283 (PC70GB69V125TF) is a premium square body high-speed semiconductor fuse designed to provide full-range protection for sensitive power electronic equipment. As part of the trusted Mersen Protistor® Size 70 gR series, it is engineered to protect semiconductor devices such as IGBTs, thyristors, diodes and rectifiers against both overloads and short-circuit faults.
Manufactured using pure silver die-cut fuse elements embedded in solidified sand, the fuse delivers exceptional current limitation, low let-through energy and high interrupting capacity. Silver-plated contact surfaces and non-magnetic hardware ensure reliable long-term operation in demanding industrial environments, while the integrated striker indicator simplifies fuse status monitoring.
With a 125 A current rating, 690 V AC IEC voltage rating and gR full-range protection characteristic, the G301283 is ideal for industrial motor drives, UPS systems, inverters, converters and other power conversion equipment operating on systems up to 690 V AC.
Key Advantages
- Full-range gR semiconductor protection fuse.
- 125 A current rating for industrial power electronics.
- 690 V AC IEC rated voltage.
- Protects against both overloads and short circuits.
- Integrated striker indicator for remote status monitoring.
- Low I²t and high breaking capacity for superior semiconductor protection.
Key Features
- Mersen Protistor® Size 70 gR series.
- Catalogue number: PC70GB69V125TF.
- 125 A rated current.
- 690 V AC IEC rated voltage.
- Square body fuse with flush ends and ISO metric threaded terminals.
- Integrated striker indication.
- Silver-plated brass terminals.
- Pure silver fuse elements embedded in solidified sand.
Reliable Protection for Industrial Power Electronics
Unlike partial-range semiconductor fuses, gR fuses provide both overload and short-circuit protection for semiconductor devices. Their ultra-fast operation limits fault current and thermal energy, helping extend the service life of expensive power electronic components while reducing maintenance costs.
The Protistor® Size 70 gR range is widely used in industrial automation, renewable energy and power conversion equipment where dependable protection and high interrupting capacity are essential for reliable system operation.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- UPS and backup power systems.
- Power converters and rectifiers.
- Renewable energy inverters.
- Protection of IGBT, thyristor and diode modules.
