Why Choose the Mersen FR14GR69V32 Protistor® High-Speed Semiconductor Fuse?
The Mersen FR14GR69V32 is a high-performance Protistor® cylindrical semiconductor protection fuse engineered for rapid, full-range protection of sensitive power electronic equipment. Its gR operating characteristic enables the fuse to clear both overload currents and short-circuit faults, helping to protect valuable semiconductor components while reducing damaging thermal and electrical stress.
Designed in a compact 14 × 51 mm cylindrical format, the FR14GR69V32 is rated at 32 A and 690 V AC under IEC standards. It is suitable for protecting IGBTs, thyristors, SCRs, diodes, rectifiers and other semiconductor devices used in drives, converters, industrial power supplies and renewable energy equipment.
The fuse offers a high 160 kA AC breaking capacity, silver-plated copper ferrule connections and a durable ceramic body. This version is supplied without a striker indicator, making it suitable for installations where remote or mechanical fuse-operation signalling is not required.
Key Advantages
- High-speed gR full-range semiconductor protection.
- 32 A rated current for industrial power-electronic circuits.
- 690 V AC IEC voltage rating.
- High 160 kA AC breaking capacity.
- Clears both overloads and short-circuit currents.
- Low let-through energy helps protect sensitive semiconductors.
- Compact 14 × 51 mm cylindrical construction.
- Suitable for coordinated circuit-protection systems.
Key Features
- Manufacturer: Mersen.
- Series: Protistor® 14 × 51 gR.
- Catalogue number: FR14GR69V32.
- Item number: H1017205.
- Current rating: 32 A.
- Voltage rating: 690 V AC IEC.
- Fuse characteristic: gR.
- Indicator: None.
- Silver-plated copper ferrule terminals.
- Ceramic insulating body.
- RoHS compliant.
Full-Range Protection for Power Semiconductors
The FR14GR69V32 uses a gR full-range characteristic, enabling it to interrupt both lower-level overload currents and high short-circuit currents. This makes it particularly suitable for power-electronic circuits where fast fault clearance and reduced let-through energy are essential.
Its current-limiting performance helps restrict the peak fault current and energy passed into downstream components. This can reduce damage to semiconductor modules, busbars and associated equipment while supporting improved system reliability and reduced maintenance downtime.
Typical Applications
- Variable-speed and frequency drives.
- Industrial inverters.
- Uninterruptible power supplies.
- AC and DC power converters.
- IGBT and thyristor protection.
- Industrial rectifier systems.
- Semiconductor power supplies.
- Battery energy-storage systems.
- Solar and renewable energy equipment.
- Industrial automation and OEM machinery.
