Why Choose the Mersen H300065 Protistor® High-Speed Fuse?
The Mersen H300065 (PC32UD69V400TF) is a Protistor® Size 32 aR square body high-speed semiconductor fuse designed to provide exceptional protection for modern power electronic equipment. Engineered specifically for semiconductor applications, it delivers ultra-fast short-circuit protection for IGBTs, thyristors, SCRs, power diodes and rectifier assemblies while helping minimise damage caused by fault currents.
Featuring a 400 A current rating, 690 V AC IEC / 700 V AC UL voltage rating and aR ultra-fast operating characteristic, the H300065 combines excellent current limitation with low let-through energy (I²t). Precision die-cut silver fuse elements embedded in solidified silica sand provide high interrupting performance, while silver-plated contacts and non-magnetic hardware ensure long-term reliability.
The fuse incorporates a mechanical striker indicator and flush-end metric threaded terminals (TF mounting style), making it suitable for demanding industrial power conversion systems including motor drives, UPS systems, renewable energy inverters and industrial converters.
Key Advantages
- Ultra-fast aR semiconductor protection.
- 400 A rated current for industrial power applications.
- 690 V AC IEC / 700 V AC UL voltage ratings.
- Excellent current limitation with low let-through energy.
- Mechanical striker indicator for fuse status monitoring.
- Designed to protect IGBTs, thyristors, SCRs and power diodes.
Key Features
- Mersen Protistor® Size 32 aR series.
- Catalogue number: PC32UD69V400TF.
- 400 A current rating.
- 690 V AC IEC / 700 V AC UL.
- Square body ceramic construction.
- Flush-end metric threaded terminals (TF).
- Integrated mechanical striker indicator.
- Silver-plated contacts with non-magnetic hardware.
Reliable Protection for Industrial Power Electronics
Protistor® semiconductor fuses are designed to limit both peak fault current and thermal energy before sensitive semiconductor devices reach damaging levels. Their extremely fast operating characteristic helps improve equipment reliability, reduce maintenance costs and minimise costly downtime in industrial installations.
The H300065 is widely used in industrial motor drives, power converters, UPS systems, renewable energy equipment and other power electronic installations requiring dependable semiconductor protection.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- Power converters and rectifiers.
- UPS and standby power systems.
- Renewable energy inverter systems.
- Protection of IGBT, SCR, thyristor and diode modules.
