Why Choose the Mersen FR14AR69V50T Protistor® High-Speed Fuse?
The Mersen FR14AR69V50T is a Protistor® high-speed cylindrical semiconductor fuse designed to provide rapid short-circuit protection for sensitive power semiconductor devices used in industrial power electronic systems. Classified as an aR semiconductor fuse, it complies with IEC 60269-4 and delivers exceptional current-limiting performance to help prevent costly damage to IGBTs, thyristors, diodes and rectifiers.
Manufactured by Mersen, the FR14AR69V50T is ideal for variable frequency drives, UPS systems, industrial inverters and other power conversion equipment. Its integrated striker (trip indicator) provides clear mechanical indication after fuse operation and can be used with compatible fuse holders for remote signalling and faster maintenance.
With a 50 A current rating, a 690 V AC IEC / 700 V AC UL voltage rating and a compact 14 × 51 mm cylindrical body, the FR14AR69V50T offers dependable semiconductor protection for demanding industrial applications.
Key Advantages
- High-speed aR semiconductor protection fuse.
- 50 A rated current for industrial power electronics.
- 690 V AC IEC / 700 V AC UL voltage rating.
- Integrated striker (trip indicator) for rapid fuse indication.
- Extremely fast current-limiting performance.
- Compact 14 × 51 mm cylindrical construction.
Key Features
- Mersen Protistor® Series.
- Catalogue number: FR14AR69V50T.
- Item number: Z1056665.
- aR utilisation category.
- 50 A rated current.
- 690 V AC IEC / 700 V AC UL rated voltage.
- 14 × 51 mm cylindrical ceramic fuse.
- Integrated striker for indication and optional remote signalling.
Fast Short-Circuit Protection for Power Semiconductors
The Mersen FR14AR69V50T has been engineered to interrupt high fault currents before they can damage expensive semiconductor devices. Its low let-through energy and fast operating characteristics reduce electrical and thermal stress, helping improve equipment reliability and extend component life.
As an aR class fuse, the FR14AR69V50T is intended for semiconductor short-circuit protection and should be coordinated with suitable overload protection where required. The integrated striker provides positive indication following fuse operation, simplifying troubleshooting and maintenance.
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.
