Why Choose the Mersen G300478 Protistor® High Speed Fuse?
The Mersen G300478 is a genuine Protistor® Size 31 aR high-speed semiconductor fuse designed to provide maximum protection for today's power electronic equipment. Engineered for demanding industrial environments, this square body fuse delivers ultra-fast fault interruption to protect sensitive semiconductor devices including IGBTs, thyristors and diodes from damaging short-circuit conditions.
With a 500 A current rating and 690 V AC (IEC) / 700 V AC (UL) voltage ratings, the G300478 is ideal for industrial drives, UPS systems, DC power systems and power conversion equipment. Its ultra-fast aR operating characteristic helps minimise let-through energy, reducing equipment damage while improving system reliability and availability.
Supplied under manufacturer part number G300478 and catalogue number A070UD31TTI500, this fuse features flush ends with UNC threaded terminals and an integrated striker indication system for straightforward monitoring and maintenance. Silver-plated contacts and a high interrupting capacity make it suitable for demanding industrial applications.
Key Advantages
- Genuine Mersen Protistor® high-speed semiconductor fuse.
- 500 A current rating for demanding industrial applications.
- 690 V AC IEC / 700 V AC UL rated operation.
- Ultra-fast aR characteristic for semiconductor protection.
- Flush-end UNC threaded terminals with integrated striker indication.
- High 200 kA breaking capacity for reliable fault interruption.
Key Features
- Mersen Protistor® Size 31 series.
- Model G300478.
- Catalogue number A070UD31TTI500.
- 500 A rated current.
- 690 V AC IEC / 700 V AC UL.
- Square body fuse with flush-end UNC threaded terminals.
- Integrated striker indication system.
- Silver-plated brass terminals for dependable electrical performance.
Reliable Protection for Power Electronics
High-speed semiconductor fuses are specifically engineered to protect sensitive electronic power devices that require extremely rapid fault interruption. Their low let-through energy helps safeguard expensive semiconductor assemblies while maintaining reliable system operation and reducing maintenance costs.
The Mersen Protistor® range is widely specified for industrial automation, motor drives, UPS systems, renewable energy installations and DC power conversion equipment where dependable semiconductor protection is essential.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial inverters.
- UPS systems.
- DC power systems.
- Motor drives and soft starters.
- Industrial power conversion equipment.
