Why Choose the Mersen R301338 Protistor® High-Speed Fuse?
The Mersen R301338, catalogue number PC72GB69V400EF, is a high-performance square body semiconductor protection fuse designed to deliver rapid fault interruption for sensitive power electronics and semiconductor equipment. As part of the trusted Mersen Protistor® Size 72 gR 690 VAC series, this fuse provides full-range protection against overloads and short circuits in demanding industrial applications.
Manufactured using high-purity silver fuse elements embedded in solidified silica sand, the R301338 offers exceptional current-limiting performance with low let-through energy (I²t). Its robust square body construction, silver-plated contacts and integrated striker make it ideal for protecting converters, variable speed drives, UPS systems and other critical power conversion equipment.
Rated at 400 A with a 690 V AC IEC voltage rating, the Mersen R301338 delivers dependable semiconductor protection while helping minimise equipment downtime and reducing the risk of costly component failures in industrial electrical systems.
Key Advantages
- High-speed gR semiconductor protection fuse for full-range fault protection.
- 400 A current rating for demanding power conversion applications.
- 690 V AC IEC voltage rating for industrial installations.
- Integrated striker indicator for remote signalling options.
- Square body design with open slot blade terminals for easy installation.
- Low I²t performance helps protect expensive semiconductor devices.
Key Features
- Mersen Protistor® Size 72 gR series.
- Catalogue number: PC72GB69V400EF.
- 400 A rated current.
- 690 V AC IEC rated voltage.
- Full-range gR semiconductor protection.
- Integrated striker for blown fuse indication.
- Silver-plated contact surfaces for reliable conductivity.
- Square body design with open slot blade terminals.
Reliable Protection for Power Electronics
High-speed semiconductor fuses are specifically engineered to protect sensitive power electronic devices from destructive fault currents before damage can occur. Their fast-acting characteristics significantly reduce thermal and electrical stress on semiconductor components, improving equipment reliability and operational safety.
The Mersen Protistor® range is widely specified by engineers for use in industrial drives, converters and renewable energy systems where dependable semiconductor protection is essential for maintaining continuous production and minimising downtime.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial power converters.
- Soft starters and motor control equipment.
- UPS and backup power systems.
- Renewable energy inverters.
- Industrial automation and semiconductor protection.
