Why Choose the Mersen P300025 Protistor® High-Speed Fuse?
The Mersen P300025 is a Protistor® Size 31 aR high-speed square body fuse designed specifically for the protection of semiconductor devices in modern power conversion equipment. Manufactured by Mersen, this fuse features a 550A current rating, 690VAC IEC / 700VAC UL voltage rating and DIN 110 blade terminals with an integrated striker, making it ideal for demanding industrial applications.
Engineered for the protection of diodes, thyristors, IGBTs and other semiconductor devices, the P300025 combines low let-through energy (I²t), high interrupting capacity and rapid fault clearing to minimise damage during short-circuit conditions. It is widely used in drives, inverters, UPS systems, converters and other power electronics.
Protistor® semiconductor fuses are manufactured using die-cut silver elements embedded within high-grade silica sand, providing controlled arc extinction, excellent reliability and consistent performance under demanding industrial operating conditions.
Key Advantages
- Ultra-fast aR semiconductor protection.
- 550A current rating.
- 690VAC IEC / 700VAC UL voltage rating.
- Protistor® Size 31 square body design.
- DIN 110 blade terminals with integrated striker.
- Excellent protection for IGBT, diode and thyristor devices.
- Low I²t reduces semiconductor damage during faults.
- Manufactured by Mersen for demanding industrial applications.
Key Features
- Manufacturer: Mersen.
- Item number: P300025.
- Catalogue number: PC31UD69V550D1A.
- Series: Protistor® Size 31.
- Fuse class: aR ultra-fast semiconductor fuse.
- Square body industrial fuse.
- DIN 110 blade mounting.
- Integrated striker for fuse indication.
Designed for Semiconductor Protection
Unlike conventional industrial fuses, Protistor® aR semiconductor fuses are engineered specifically 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 P300025 is suitable for variable speed drives, soft starters, DC drives, UPS equipment, renewable energy converters, industrial power supplies and other power conversion equipment where semiconductor protection is critical.
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.
