Why Choose the Mersen J300480 Protistor® High-Speed Semiconductor Fuse?
The Mersen J300480 is a high-performance Protistor® square body high-speed semiconductor fuse engineered to provide ultra-fast protection for modern power electronic equipment. Designed specifically for safeguarding semiconductors such as IGBTs, thyristors (SCRs), diodes and rectifiers, it delivers exceptional fault current limitation and rapid interruption to minimise equipment damage during short-circuit conditions.
As part of Mersen's globally recognised Protistor® Size 31 aR series, the J300480 combines high breaking capacity with low let-through energy, making it ideal for protecting expensive power conversion equipment. Its silver-plated contacts, robust square body construction and integrated striker provide dependable performance in demanding industrial applications.
Rated at 630 A with a 690 V AC (IEC) / 700 V AC (UL) voltage rating, the J300480 is widely used in variable speed drives, UPS systems, inverters, converters and renewable energy equipment where reliable semiconductor protection is essential.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 630 A current rating for demanding industrial applications.
- 690 V AC IEC / 700 V AC UL voltage rating.
- Excellent current-limiting characteristics reduce semiconductor damage.
- Integrated striker for remote fuse indication.
- Reliable protection for modern power conversion equipment.
Key Features
- Mersen Protistor® Size 31 aR series.
- 630 A rated current.
- 690 V AC (IEC) / 700 V AC (UL) rated voltage.
- Square body fuse with flush ends and UNC threaded connections.
- Integrated striker indicator.
- Silver-plated contact surfaces.
- Solidified sand construction for controlled arc performance.
- Designed for protection of IGBTs, SCRs and semiconductor devices.
Reliable Protection for Industrial Power Electronics
High-speed semiconductor fuses are designed to clear fault currents before sensitive power electronic components suffer thermal or electrical damage. Their low let-through energy helps improve equipment reliability while reducing maintenance costs and downtime.
The Mersen Protistor® range has become a trusted choice for OEMs, panel builders and industrial maintenance engineers requiring dependable protection for power conversion systems and high-value semiconductor devices.
Typical Applications
- Variable speed drives (VSDs).
- Industrial motor drives.
- Power converters and inverters.
- UPS systems.
- Renewable energy installations.
- Battery energy storage systems.
- Industrial power supplies.
- Semiconductor protection circuits.
