Why Choose the Mersen W221141 High-Speed Semiconductor Fuse?
The Mersen W221141 is a premium Protistor® square body high-speed semiconductor fuse designed to provide exceptional protection for power semiconductor devices operating in demanding DC applications. As part of the proven Mersen Protistor® Size 122 gR 750 VDC series, it delivers rapid fault interruption to minimise damage to sensitive components while maximising system reliability.
Developed for railway power systems, industrial converters and DC power electronics, the W221141 combines low I²t performance, high breaking capacity and low power dissipation. Its square body construction with open slot blade terminals and integrated striker provides straightforward installation while ensuring dependable operation in demanding industrial environments.
With a rated current of 350 A and a 750 V DC IEC voltage rating, the Mersen W221141 is ideally suited to protecting IGBTs, thyristors, diodes and other semiconductor devices used in high-power DC applications.
Key Advantages
- High-speed semiconductor protection fuse for demanding DC applications.
- 350 A current rating for industrial power equipment.
- 750 V DC IEC voltage rating for modern power systems.
- Ultra-fast gR characteristic provides full-range semiconductor protection.
- Integrated striker mechanism for fuse status indication.
- 100 kA DC breaking capacity ensures dependable fault interruption.
Key Features
- Mersen Protistor® Size 122 gR series.
- 350 A rated current.
- 750 V DC IEC rated voltage.
- 100 kA DC breaking capacity.
- Square body construction with open slot blade terminals.
- Integrated striker for blown fuse indication.
- Low I²t design for superior semiconductor protection.
- Suitable for railway and industrial power conversion equipment.
Reliable Protection for High-Power Electronics
High-speed semiconductor fuses are specifically engineered to protect sensitive power electronic devices against damaging short circuits. Their extremely fast response limits fault energy, helping reduce equipment damage, minimise downtime and extend the operational life of critical components.
The Mersen Protistor® range is trusted worldwide for railway traction systems, industrial drives, UPS equipment, renewable energy installations and other demanding DC power applications requiring reliable semiconductor protection.
Typical Applications
- Railway traction and auxiliary power systems.
- Industrial motor drives and converters.
- UPS and backup power equipment.
- Renewable energy power conversion systems.
- Battery energy storage systems.
- Protection of IGBTs, thyristors and semiconductor modules.
