Why Choose the Mersen F300546 Protistor® High-Speed Fuse?
The Mersen F300546 (catalogue number PC71UD13C250D1A) is a premium Protistor® square body high-speed semiconductor protection fuse engineered to deliver exceptional protection for modern power electronic equipment. Designed specifically to safeguard IGBTs, thyristors, diodes and semiconductor modules, it provides ultra-fast fault interruption to minimise damage during short-circuit conditions.
As part of the trusted Mersen Protistor® Size 71 aR series, this fuse features low let-through energy (I²t), silver-plated contact surfaces and a robust ceramic square body construction. The integrated striker indicator enables remote status indication or operation of an optional microswitch, simplifying maintenance and improving system monitoring.
Rated at 250 A with an operating voltage of 1250 V AC (IEC) and 1300 V AC (UL), the F300546 is ideally suited for protecting high-power variable speed drives, converters, UPS systems, renewable energy equipment and industrial automation installations requiring dependable semiconductor protection.
Key Advantages
- Ultra-fast aR semiconductor protection fuse for sensitive power electronics.
- 250 A current rating for industrial power applications.
- 1250 V AC IEC / 1300 V AC UL voltage rating.
- 126 kA breaking capacity for outstanding fault interruption.
- Integrated striker indicator for remote indication and 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 71 aR series.
- 250 A rated current.
- 1250 V AC (IEC) / 1300 V AC (UL).
- Ultra-fast acting aR characteristic.
- Square body ceramic fuse construction.
- DIN 110 blade terminals.
- Integrated striker indication system.
- Low I²t performance for superior semiconductor protection.
Reliable Protection for High-Power Electronics
The Mersen F300546 is designed to interrupt high fault currents before they can damage expensive semiconductor devices. Its extremely 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 in 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.
