Why Choose the Mersen H300042 Protistor® High-Speed Fuse?
The Mersen H300042 (PC31UD69V500EF) is a premium square body high-speed semiconductor fuse from the Protistor® Size 31 aR series, engineered to provide outstanding short-circuit protection for modern power electronic equipment. Specifically designed for semiconductor applications, it delivers ultra-fast fault interruption to protect sensitive devices including IGBTs, thyristors, SCRs and power diodes from damaging fault currents.
Manufactured using precision die-cut silver fuse elements embedded in solidified silica sand, the fuse offers exceptional current limitation, low let-through energy (I²t) and high interrupting capacity. Silver-plated contact surfaces and non-magnetic hardware provide long-term reliability, while the integrated striker indicator enables local indication and optional remote signalling using compatible microswitch accessories.
With a 500 A current rating, 690 V AC IEC / 700 V AC UL voltage rating and aR ultra-fast operating characteristic, the H300042 is ideally suited to industrial drives, UPS systems, power converters, renewable energy equipment and other demanding semiconductor protection applications.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 500 A current rating for demanding industrial applications.
- 690 V AC IEC / 700 V AC UL voltage ratings.
- Designed specifically for protecting IGBTs, thyristors, SCRs and power diodes.
- Integrated striker indicator for fuse status monitoring.
- Excellent current limitation with low let-through energy.
Key Features
- Mersen Protistor® Size 31 aR series.
- Catalogue number: PC31UD69V500EF.
- 500 A rated current.
- 690 V AC IEC / 700 V AC UL rated voltage.
- Square body ceramic fuse.
- Open slot blade terminals (EF mounting style).
- Integrated mechanical striker indication.
- Silver-plated contacts with non-magnetic hardware.
Reliable Protection for Industrial Power Electronics
The Protistor® Size 31 range has been developed to provide state-of-the-art semiconductor protection for industrial power conversion equipment. Its ultra-fast operating characteristic limits peak fault current and thermal energy, helping maximise the service life of expensive semiconductor assemblies while reducing maintenance costs and equipment downtime.
The H300042 is widely used in industrial automation, renewable energy systems, UPS installations, motor drives and power conversion equipment where dependable semiconductor protection is essential.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- Power converters and rectifiers.
- UPS and standby power systems.
- Renewable energy inverters.
- Protection of IGBT, SCR, thyristor and diode modules.
