Why Choose the Mersen D221447 FR27GB80V100T Protistor® High-Speed Fuse?
The Mersen D221447, catalogue reference FR27GB80V100T, is a high-performance Protistor® cylindrical semiconductor fuse designed to provide full-range protection for sensitive power semiconductor equipment. Its fast-acting gR characteristic protects against both overloads and semiconductor fault currents, helping safeguard IGBTs, thyristors, SCRs, diodes and rectifier assemblies.
Rated at 100 A and 800 V AC, this compact fuse-link is engineered for small power conversion equipment where fast interruption, low energy let-through and a high breaking capacity are essential. Die-cut fuse elements are embedded within solidified sand to control arcing characteristics and provide dependable current-limiting performance.
The D221447 features a durable ceramic body, silver-plated copper ferrule terminals and an integrated mechanical striker indicator. The striker provides clear indication following fuse operation and can be used with compatible microswitches or monitoring accessories to support remote signalling and faster fault diagnosis.
Key Advantages
- Full-range gR semiconductor protection.
- Protects against both overloads and short-circuit faults.
- 100 A rated current.
- 800 V AC IEC voltage rating.
- Low I²t reduces thermal and mechanical stress on semiconductor devices.
- Integrated striker supports rapid fault identification.
- Compact cylindrical construction simplifies installation.
- High interrupting capability for demanding industrial systems.
Key Features
- Mersen Protistor® high-speed semiconductor fuse-link.
- Catalogue reference FR27GB80V100T.
- gR / gRB operating characteristic.
- 100 A rated current.
- 800 V AC rated voltage.
- Integrated mechanical striker indicator.
- Die-cut fuse elements embedded in solidified sand.
- Ceramic insulating body.
- Silver-plated copper ferrule terminals.
- Clip-mounted cylindrical design.
- RoHS compliant.
Full-Range Semiconductor Protection
Unlike partial-range semiconductor fuses that primarily protect against short circuits, the Mersen D221447 uses a gR full-range characteristic. This enables the fuse to protect semiconductor circuits against both sustained overload conditions and high-level fault currents, reducing the need for separate overload protection in appropriately designed applications.
Its current-limiting construction rapidly restricts peak fault current and total energy let-through. This helps prevent excessive junction temperatures, damaged semiconductor modules and secondary damage within power conversion equipment.
Integrated Striker for Faster Maintenance
The built-in striker provides an immediate mechanical indication when the fuse has operated. When paired with a compatible microswitch or monitoring accessory, it can also initiate remote alarms, control-system inputs or equipment shutdown functions.
This indication capability helps maintenance engineers identify the affected circuit quickly, shorten troubleshooting time and restore equipment to service efficiently.
Typical Applications
- Variable frequency drives and motor drives.
- Industrial inverters.
- Power conversion equipment.
- Rectifier assemblies.
- Uninterruptible power supplies.
- Industrial automation systems.
- Semiconductor power modules.
- Renewable energy conversion equipment.
- Industrial control and power distribution panels.
