Why Choose the Mersen FR14GR69V50 High-Speed Fuse?
The Mersen FR14GR69V50 is a high-performance 50 A cylindrical semiconductor fuse engineered to protect sensitive power electronic components against overload and short-circuit currents. Part of the trusted Mersen Protistor® 14 × 51 mm gR range, it combines an ultra-fast operating response with an exceptionally high interrupting capacity for demanding industrial applications.
Its gR full-range operating characteristic provides comprehensive semiconductor protection across the complete current range. The fuse limits the thermal and electrical energy transferred during a fault, helping protect IGBTs, thyristors, diodes, rectifiers, inverters, variable frequency drives and other valuable power electronic devices.
Rated at 50 A and 690 V AC under IEC standards, the FR14GR69V50 features a compact ceramic body with silver-plated copper ferrules for reliable conductivity and mechanical durability. This version is supplied without a striker indicator and is intended for installation in a compatible 14 × 51 mm clip-mounted fuse holder.
Key Advantages
- Full-range gR semiconductor protection against overloads and short circuits.
- 50 A rated current for demanding power electronic applications.
- 690 V AC IEC voltage rating.
- Exceptionally high 160 kA AC breaking capacity.
- Low let-through energy helps reduce damage to sensitive components.
- Compact 14 × 51 mm cylindrical format for efficient panel installation.
Key Features
- Mersen Protistor® high-speed fuse technology.
- 50 A ampere rating.
- 690 V AC IEC rated voltage.
- gR full-range speed characteristic.
- 160 kA maximum AC interrupting capacity.
- 387 A²s melting I²t.
- 2,250 A²s clearing I²t at rated voltage.
- Ceramic insulating body for industrial durability.
- Silver-plated copper ferrule terminals.
- Clip mounting in compatible cylindrical fuse holders.
Full-Range Protection for Power Electronics
Semiconductor components can be permanently damaged by fault energy before conventional circuit protection devices respond. The Mersen FR14GR69V50 is designed to interrupt faults rapidly and restrict the amount of damaging energy that reaches connected equipment, helping reduce component failure, repair costs and unplanned downtime.
Unlike partial-range aR fuses, the gR classification provides protection against both overload and short-circuit conditions. This makes the FR14GR69V50 particularly suitable for applications requiring comprehensive semiconductor protection from a single fuse-link.
Typical Applications
- Variable frequency drives and industrial motor controls.
- Power converters and frequency converters.
- Industrial inverters.
- Rectifiers, thyristors and diode assemblies.
- Uninterruptible power supply systems.
- Industrial battery chargers and power supplies.
- Renewable energy and energy-storage equipment.
- Automation machinery and electrical control panels.
