Why Choose the Mersen FR14AR69V40T Protistor® High-Speed Fuse?
The Mersen FR14AR69V40T is a premium Protistor® high-speed semiconductor fuse engineered to provide rapid short-circuit protection for sensitive power semiconductor devices used in industrial power electronics. Featuring an aR utilisation category, this fuse is specifically designed for the partial-range protection of semiconductors such as IGBTs, thyristors, diodes and rectifiers operating in demanding industrial environments.
Manufactured by Mersen, the FR14AR69V40T combines extremely fast fault-clearing performance with a compact cylindrical design to minimise damage caused by fault currents. The integrated striker indicator provides mechanical indication following fuse operation and supports remote signalling where compatible fuse holders are used.
With a 40 A current rating, 690 V AC IEC / 700 V AC UL voltage rating and a compact 14 × 51 mm cylindrical body, the FR14AR69V40T is ideal for industrial drives, inverters, UPS systems and power conversion equipment requiring dependable semiconductor protection.
Key Advantages
- Fast-acting aR semiconductor protection fuse.
- 40 A rated current for industrial power electronics.
- 690 V AC IEC / 700 V AC UL voltage rating.
- Integrated striker indicator for fuse status monitoring.
- High 160 kA breaking capacity.
- Compact 14 × 51 mm cylindrical design.
Key Features
- Mersen Protistor® Series.
- Model: FR14AR69V40T.
- aR utilisation category for semiconductor short-circuit protection.
- 40 A rated current.
- 690 V AC IEC / 700 V AC UL rated.
- 14 × 51 mm cylindrical fuse body.
- Integrated striker for indication and remote signalling.
- Low let-through energy for enhanced semiconductor protection.
Fast Protection for Critical Semiconductor Devices
The Mersen FR14AR69V40T has been developed to rapidly disconnect high fault currents before they can damage expensive semiconductor components. Its extremely fast operating characteristics help reduce thermal stress, improve equipment reliability and minimise costly downtime within industrial electrical systems.
As an aR class fuse, this model provides partial-range protection against short-circuit faults and should be used alongside appropriate overload protection where required by the application. The built-in striker also enables faster fault identification during maintenance.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- Power converters and rectifiers.
- Industrial inverters.
- UPS systems.
- Protection of IGBTs, thyristors and other semiconductor devices.
