Why Choose the Mersen F330193 Protistor® High-Speed Fuse?
The Mersen F330193 is a Protistor® NH Size 000 high-speed semiconductor fuse designed to deliver ultra-fast protection for sensitive power electronic equipment. Catalogued as DN000UB50V400L, this aR class fuse is rated at 400 A and 500 V AC (IEC/UL), making it ideal for protecting IGBTs, thyristors, diodes and rectifiers against damaging short-circuit currents.
The F330193 features a compact NH Size 000 square-body design with DIN 80 blade terminals and an integrated striker indicator, enabling both visual indication and operation of an optional microswitch for remote fuse status monitoring. Silver-plated contacts and precision-manufactured fuse elements provide low I²t values and excellent current-limiting performance.
Designed for industrial power conversion equipment, this Protistor® fuse is widely used in variable frequency drives, UPS systems, industrial inverters and other semiconductor-based applications where rapid fault clearance is essential to minimise equipment damage and downtime.
Key Advantages
- Ultra-fast aR semiconductor protection.
- 400 A rated current.
- 500 V AC IEC / UL rated voltage.
- Integrated striker for visual and remote indication.
- Low I²t reduces stress on semiconductor devices.
- Silver-plated DIN 80 blade contacts.
- Compact NH Size 000 construction for industrial applications.
Key Features
- Manufacturer: Mersen.
- Series: Protistor®.
- Item number: F330193.
- Catalogue number: DN000UB50V400L.
- NH Size 000 square-body fuse.
- 400 A current rating.
- 500 V AC IEC / UL rating.
- aR utilisation category.
- Integrated striker indication system.
- DIN 80 blade terminals with silver-plated contacts.
Engineered for High-Speed Semiconductor Protection
Modern power semiconductors require extremely fast fault protection to prevent catastrophic damage. The Mersen F330193 limits fault current rapidly, significantly reducing thermal and mechanical stress on expensive semiconductor devices while improving equipment reliability and reducing maintenance costs.
Its integrated striker enables simple visual indication and can operate an optional microswitch for remote monitoring, making the fuse particularly suitable for industrial automation and critical power conversion systems where rapid fault diagnosis is important.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- Power converters and rectifiers.
- Industrial UPS systems.
- Power supplies.
- Renewable energy converters.
- Industrial automation equipment.
- Semiconductor protection systems.
