Why Choose the Mersen W300031 Protistor® Fuse?
The Mersen W300031 is a high-performance Protistor® ultra-fast semiconductor fuse designed to provide superior protection for modern power electronic equipment. Engineered for demanding industrial applications, this square body fuse delivers rapid fault interruption to protect sensitive semiconductor components including IGBTs, thyristors, diodes and rectifiers from damaging short-circuit currents.
Manufactured by Mersen, a global specialist in electrical power and advanced materials, the W300031 combines excellent current limiting performance with high breaking capacity to minimise equipment damage and improve system reliability. Its robust construction and silver-plated contacts ensure dependable performance in harsh industrial environments.
With a 400 A current rating, 690 V AC IEC / 700 V AC UL voltage rating and an aR ultra-fast protection characteristic, the W300031 is ideally suited for protecting variable speed drives, industrial inverters, UPS systems, converters and renewable energy equipment.
Key Advantages
- Ultra-fast Protistor® semiconductor protection fuse.
- 400 A current rating for demanding industrial applications.
- 690 V AC IEC / 700 V AC UL rated voltage.
- aR characteristic designed specifically for semiconductor protection.
- High interrupting capacity reduces equipment damage during faults.
- Excellent current limiting performance.
- Suitable for industrial drives, converters and power electronic systems.
Key Features
- Manufacturer: Mersen
- Series: Protistor® Size 31
- Model: W300031 (A070UD31KI400)
- Square body high-speed fuse.
- 400 A rated current.
- 690 V AC IEC / 700 V AC UL rating.
- aR ultra-fast semiconductor protection.
- Striker indicator.
- Slotted blade terminals.
- Silver-plated contact surfaces.
- Suitable for protecting diodes, thyristors and IGBT devices.
Reliable Protection for Industrial Power Electronics
Ultra-fast semiconductor fuses are engineered to disconnect fault currents before excessive thermal energy can damage expensive power electronic components. Their rapid operating characteristics help maximise equipment availability while reducing maintenance costs and minimising production downtime.
The Mersen Protistor® range is trusted worldwide for protecting industrial motor drives, renewable energy systems, converters and UPS installations where dependable semiconductor protection is essential for safe and efficient operation.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- Power converters.
- UPS systems.
- Renewable energy inverters.
- Industrial rectifiers.
- Soft starters.
- Semiconductor protection circuits.
