Why Choose the Mersen F300707 Protistor® High-Speed Fuse?
The Mersen F300707 (catalogue number A070UD31LI800) is a premium Protistor® square body high-speed semiconductor protection fuse engineered to provide exceptional protection for modern power electronic equipment. Designed specifically to safeguard IGBTs, thyristors, diodes and semiconductor modules, it delivers ultra-fast fault interruption to minimise damage during severe short-circuit conditions.
As part of the proven Mersen Protistor® Size 31 aR series, this fuse features low let-through energy (I²t), silver-plated contact surfaces and a robust square body construction filled with solidified sand for superior arc control. The integrated striker indicator can operate an optional microswitch for remote status indication, simplifying maintenance and improving system monitoring.
With a rated current of 800 A and voltage ratings of 690 V AC (IEC) and 700 V AC (UL), the F300707 is ideally suited for industrial drives, power converters, UPS systems, renewable energy equipment and other demanding semiconductor protection applications.
Key Advantages
- Ultra-fast aR semiconductor protection fuse for sensitive power electronics.
- 800 A current rating for demanding industrial applications.
- 690 V AC IEC / 700 V AC UL voltage rating.
- 200 kA breaking capacity for exceptional fault interruption.
- Integrated striker indicator for simplified maintenance.
- Silver-plated contacts provide excellent conductivity and long service life.
- Designed to protect IGBTs, thyristors, diodes and semiconductor modules.
Key Features
- Mersen Protistor® Size 31 aR series.
- 800 A rated current.
- 690 V AC (IEC) / 700 V AC (UL).
- Ultra-fast acting aR characteristic.
- Square body ceramic fuse construction.
- Long slotted blade terminals.
- Integrated striker indication.
- Low I²t performance for superior semiconductor protection.
Reliable Protection for High-Power Electronics
The Mersen F300707 is designed to interrupt high fault currents before they can damage expensive semiconductor devices. Its ultra-fast operating characteristics and low energy let-through help maximise equipment reliability while reducing maintenance costs and unplanned downtime.
This Protistor® fuse is widely used throughout industrial automation, renewable energy systems and power conversion equipment where dependable protection of semiconductor devices is essential for safe and reliable operation.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor control systems.
- Power converters and rectifiers.
- Renewable energy inverter systems.
- UPS systems.
- Industrial automation equipment.
- Protection of IGBTs, thyristors and diodes.
- High-power power conversion equipment.
