Why Choose the Mersen FR14GR69V12T High-Speed Fuse?
The Mersen FR14GR69V12T is a high-performance 12 A cylindrical semiconductor fuse designed to provide rapid and dependable protection for sensitive power electronic components. Part of the trusted Mersen Protistor® 14 × 51 mm gR fuse series, it delivers full-range protection against overloads and short-circuit currents in demanding industrial electrical systems.
This high-speed fuse features a gR operating characteristic, making it suitable for protecting semiconductors across the complete current range. Its low pre-arcing energy and extremely high breaking capacity help reduce damaging thermal and electrical stress on diodes, thyristors, rectifiers, inverters, variable speed drives and other power electronic devices.
With a rated current of 12 A and an IEC rated voltage of 690 V AC, the FR14GR69V12T is suitable for industrial power conversion and automation applications. Its integrated striker indication system provides a clear mechanical indication when the fuse has operated and can support compatible remote signalling accessories.
Key Advantages
- High-speed semiconductor protection fuse for industrial power electronics.
- 12 A rated current for precise circuit protection.
- 690 V AC IEC voltage rating for demanding industrial systems.
- gR full-range characteristic protects against overloads and short circuits.
- Extremely high 160 kA AC breaking capacity.
- Integrated striker indication helps simplify fault identification.
Key Features
- Mersen Protistor® high-speed fuse series.
- 12 A ampere rating.
- 690 V AC IEC rated voltage.
- gR speed and operating characteristic.
- 160 kA maximum AC interrupting capacity.
- 5.4 A²s melting I²t.
- 60 A²s clearing I²t at rated voltage.
- Integrated striker for fuse operation indication.
- Durable ceramic body with silver-plated copper ferrule terminals.
Full-Range Protection for Power Semiconductors
Power semiconductor devices can be damaged by overloads or short-duration fault currents before conventional circuit protection devices respond. The Mersen FR14GR69V12T is designed to operate rapidly and limit the thermal energy passed through to connected components, helping reduce equipment damage and unplanned production downtime.
Unlike partial-range aR fuses, the gR characteristic provides full-range semiconductor protection against both overload and short-circuit conditions. This makes the fuse particularly suitable for power conversion equipment, industrial motor drives and electronic control systems where comprehensive high-speed protection is required.
Typical Applications
- Variable frequency drives and industrial motor controls.
- Power inverters and frequency converters.
- Rectifiers, thyristors and diode assemblies.
- Uninterruptible power supply systems.
- Industrial battery chargers and power supplies.
- Automation equipment and electrical control panels.
- Renewable energy and energy storage systems.
