Why Choose the Mersen D300475 Protistor® High-Speed Semiconductor Fuse?
The Mersen D300475 is a genuine Protistor® Size 31 square body high-speed semiconductor fuse designed to provide ultra-fast protection for sensitive power electronic equipment. Manufactured as an aR class semiconductor fuse, it protects diodes, thyristors, IGBTs and other semiconductor devices operating on 690 V AC (IEC) and 700 V AC (UL) systems. This model has a 350 A current rating and features an integrated striker indicator with flush-end UNC threaded terminals.
Manufactured by Mersen, Catalogue Number A070UD31TTI350, the D300475 forms part of the internationally recognised Protistor® range. It features silver-plated contact surfaces, non-magnetic hardware and precision-manufactured fuse elements embedded in solidified silica sand, providing low let-through energy and outstanding semiconductor protection.
With a 200 kA AC breaking capacity, robust ceramic square body construction and flush-end threaded connections, the D300475 is ideally suited for industrial drives, converters, UPS systems, renewable energy equipment and other demanding power conversion applications requiring rapid fault interruption.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 350 A rated current.
- 690 V AC IEC / 700 V AC UL voltage rating.
- Integrated striker indicator for rapid fault indication.
- Flush-end UNC threaded terminals for secure bolted installation.
- 200 kA interrupting capacity.
Key Features
- Mersen Protistor® Size 31 semiconductor fuse.
- Catalogue number: A070UD31TTI350.
- 350 A rated current.
- 690 V AC IEC / 700 V AC UL.
- aR operating class.
- Integrated striker indication.
- Flush-end UNC threaded terminals.
- Square body bolted mounting.
Engineered for High-Speed Semiconductor Protection
Protistor® semiconductor fuses are engineered to minimise fault energy during overloads and short circuits, helping to protect expensive semiconductor devices while reducing equipment downtime. Their ultra-fast operating characteristics make them ideal for industrial power conversion equipment where fast fault clearance is essential.
The Mersen D300475 combines low I²t performance, high interrupting capacity and rugged construction to provide dependable protection in industrial automation, motor drives, UPS systems, renewable energy installations and power converters.
Typical Applications
- Variable speed drives.
- Industrial power converters.
- UPS systems.
- Renewable energy inverters.
- Motor control centres.
- Semiconductor protection circuits.
