Why Choose the Mersen P300071 Protistor® High-Speed Fuse?
The Mersen P300071 is a Protistor® Size 32 aR high-speed square body fuse designed to provide exceptional protection for semiconductor devices used in modern power conversion equipment. Manufactured by Mersen, this fuse features an 800A current rating, 690VAC IEC / 700VAC UL voltage rating and flush-end metric threaded terminals with an integrated striker, making it ideal for demanding industrial applications.
Engineered specifically for the protection of diodes, thyristors and IGBT devices, the P300071 delivers low let-through energy (I²t), high interrupting capacity and ultra-fast fault clearing to minimise damage during short-circuit conditions. It is widely used in variable speed drives, UPS systems, industrial inverters, converters and other power electronic equipment.
Protistor® semiconductor fuses are manufactured using die-cut silver elements embedded in solidified silica sand, providing controlled arc extinction, excellent reliability and consistent protection under demanding industrial operating conditions. Silver-plated contact surfaces and non-magnetic hardware further enhance long-term performance.
Key Advantages
- Ultra-fast aR semiconductor protection.
- 800A current rating.
- 690VAC IEC / 700VAC UL voltage rating.
- Protistor® Size 32 square body design.
- Flush-end metric threaded terminals with integrated striker.
- Excellent protection for IGBT, diode and thyristor devices.
- Low I²t reduces semiconductor damage during fault conditions.
- Manufactured by Mersen for demanding industrial environments.
Key Features
- Manufacturer: Mersen.
- Item number: P300071.
- Catalogue number: PC32UD69V800TF.
- Series: Protistor® Size 32.
- Fuse class: aR ultra-fast semiconductor fuse.
- Square body industrial fuse.
- Flush-end metric threaded terminals.
- Integrated striker indicator.
Designed for Semiconductor Protection
Unlike conventional industrial fuses, Protistor® aR semiconductor fuses are specifically engineered to protect sensitive power electronic devices. Their extremely fast operating characteristics minimise thermal and electrical stress during fault conditions, helping to extend the service life of expensive semiconductor components.
The P300071 is suitable for variable speed drives, soft starters, industrial UPS systems, renewable energy converters, power supplies and other power conversion equipment where fast semiconductor protection is essential.
Typical Applications
- Variable speed drives (VSDs).
- Industrial inverters and converters.
- UPS systems.
- Soft starters.
- Renewable energy power converters.
- Industrial power supplies.
- Motor drives.
- Semiconductor protection circuits.
