Why Choose the Mersen Z221443 Protistor® High-Speed Fuse?
The Mersen Z221443, catalogue number FR27GB80V40T, is a Protistor® high-speed cylindrical semiconductor fuse designed to provide full-range protection for sensitive power semiconductor devices operating in demanding industrial power electronic systems. Classified as a gR (gRB) semiconductor fuse, it complies with IEC 60269-1 and IEC 60269-4, delivering rapid fault interruption for both overload and short-circuit conditions.
Manufactured by Mersen, the Z221443 is ideal for protecting IGBTs, thyristors, diodes and rectifiers used in variable frequency drives, UPS systems, industrial inverters and power conversion equipment. Its integrated trip indicator (striker) provides positive indication following fuse operation and can be used with compatible fuse holders for remote signalling.
With a 40 A current rating, an 800 V AC IEC voltage rating and a robust 27 × 60 mm cylindrical body, the FR27GB80V40T offers reliable semiconductor protection while supporting compact equipment design and simplified maintenance.
Key Advantages
- Fast-acting gR (gRB) semiconductor protection fuse.
- 40 A rated current.
- 800 V AC IEC voltage rating.
- Integrated trip indicator (striker).
- Full-range protection against overloads and short circuits.
- High interrupting capacity for demanding industrial applications.
Key Features
- Mersen Protistor® Series.
- Item number: Z221443.
- Catalogue number: FR27GB80V40T.
- gR (gRB) utilisation category.
- 40 A rated current.
- 800 V AC IEC rated voltage.
- 27 × 60 mm cylindrical ceramic fuse.
- Integrated striker for indication and remote signalling.
Reliable Full-Range Semiconductor Protection
The Mersen Z221443 has been engineered to rapidly interrupt excessive fault currents before they can damage expensive semiconductor devices. Its low let-through energy helps minimise electrical and thermal stress, extending equipment life while improving overall system reliability.
As a gR (gRB) class fuse, the FR27GB80V40T provides full-range protection against both overloads and short-circuit faults. The integrated striker allows quick identification of an operated fuse and supports remote monitoring when used with compatible fuse holders.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- UPS systems.
- Industrial inverters.
- Power converters and rectifiers.
- Protection of IGBTs, thyristors and other semiconductor devices.
