Why Choose the Mersen FR14AR69V20T Semiconductor Fuse?
The Mersen FR14AR69V20T is an ultra-fast semiconductor protection fuse designed to safeguard sensitive power electronic devices against high short-circuit currents. Its rapid operating characteristics help minimise peak current and let-through energy, reducing the risk of costly damage to semiconductor components.
Featuring an aR utilisation category, the FR14AR69V20T provides partial-range protection for semiconductor circuits. It is specifically engineered to interrupt short-circuit faults and should normally be used with suitable separate overload protection as part of a coordinated electrical protection system.
Rated at 20 A and 690 V AC under IEC requirements, this compact fuse is suitable for industrial drives, converters, rectifiers and power supplies. Its 14 × 51 mm cylindrical format includes an integrated striker for local fuse-status indication or operation of a compatible auxiliary signalling device.
Key Advantages
- Ultra-fast short-circuit protection for semiconductor devices.
- 20 A rated current for power electronic circuits.
- 690 V AC IEC rating for industrial applications.
- aR partial-range classification optimised for semiconductor protection.
- Integrated striker supports fast identification of an operated fuse.
- Low let-through energy helps reduce thermal and electrical stress.
Key Features
- Mersen Protistor ultra-fast semiconductor fuse.
- 20 A rated current.
- 690 V AC IEC rated voltage.
- aR utilisation category.
- 14 × 51 mm cylindrical cartridge.
- Integrated striker indication mechanism.
- Rapid interruption of high short-circuit currents.
- Suitable for compatible cylindrical fuse holders.
Fast Protection for Sensitive Power Electronics
Semiconductor devices can be damaged extremely quickly when subjected to excessive fault current. The Mersen FR14AR69V20T is designed to respond rapidly, limiting the current peak and thermal energy that reach the protected components during a short circuit.
As an aR-class fuse, it provides short-circuit protection from a specified multiple of its rated current up to its breaking capacity. Appropriate overload protection should therefore be incorporated separately where required by the circuit design and applicable electrical standards.
Typical Applications
- Variable frequency drives and motor controllers.
- Industrial rectifiers and power converters.
- Inverter and frequency-conversion equipment.
- UPS and industrial power supply systems.
- Semiconductor switching assemblies.
- Automation and electrical control panels.
