Why Choose the Mersen L301034 Protistor® High-Speed Fuse?
The Mersen L301034, catalogue number A120UD71TTI550, is a Protistor® Size 71 square body high-speed semiconductor fuse designed to provide advanced protection for modern power conversion equipment. Featuring an ultra-fast aR operating characteristic, it delivers exceptional protection for IGBTs, thyristors, diodes and other sensitive semiconductor devices against damaging short-circuit currents.
Designed for demanding industrial applications, the L301034 incorporates precision die-cut fuse elements embedded in solidified sand for controlled arc extinction, low I²t performance and high interrupting capacity. The fuse features flush ends with UNC threaded terminals (TTI), silver-plated contact surfaces, non-magnetic hardware and an integrated striker indicator for optional remote monitoring.
With a 550 A current rating, 1100 V AC IEC and 1200 V AC UL voltage ratings, the Mersen L301034 is ideally suited to industrial drives, renewable energy converters, UPS systems, traction equipment and other high-power semiconductor applications.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 550 A current rating for demanding industrial applications.
- 1100 V AC IEC / 1200 V AC UL voltage capability.
- Low I²t characteristics minimise semiconductor damage.
- 150 kA AC breaking capacity.
- Flush UNC threaded terminals for secure bolted installation.
- Integrated striker supports optional remote indication.
- Silver-plated contacts for reliable long-term performance.
Key Features
- Mersen Protistor® Size 71 series.
- Catalogue number: A120UD71TTI550.
- 550 A rated current.
- 1100 V AC IEC / 1200 V AC UL rated voltage.
- aR ultra-fast operating characteristic.
- Flush ends with UNC threaded terminals (TTI).
- Integrated low-voltage striker indicator.
- Silver-plated contact surfaces.
- Square body ceramic construction.
Designed for High-Power Semiconductor Protection
Protistor® semiconductor fuses are specifically engineered to interrupt extremely high fault currents before expensive semiconductor devices suffer catastrophic damage. Their ultra-fast operation and low energy let-through characteristics maximise equipment reliability while reducing maintenance costs across demanding industrial power conversion systems.
The robust square body construction, precision fuse elements, silver-plated contacts and integrated striker make the Mersen L301034 an excellent solution for protecting industrial converters, motor drives, renewable energy systems and other critical semiconductor equipment.
Typical Applications
- High-power variable speed drives.
- Industrial power converters.
- Renewable energy inverters.
- UPS systems.
- Industrial rectifiers.
- Traction power equipment.
- IGBT, thyristor and diode protection.
