Why Choose the Mersen R220953 High-Speed Semiconductor Fuse?
The Mersen R220953 is a high-performance Protistor® square body high-speed semiconductor fuse engineered to provide exceptional protection for power semiconductor devices in demanding DC applications. Designed as part of the trusted Mersen Protistor® Size 122 gR 750 VDC series, it delivers rapid fault interruption to help minimise damage to sensitive components and improve system reliability.
Developed for modern power conversion systems, railway applications and industrial DC equipment, the R220953 combines fast-acting protection with low power losses and high breaking capacity. Its robust square body construction with flush metric threaded terminals and integrated striker makes installation straightforward while ensuring dependable operation in harsh industrial environments.
Rated at 450 A with a 750 V DC IEC voltage rating, the Mersen R220953 is ideal for protecting semiconductor devices including IGBTs, thyristors, diodes and DC power electronics where rapid fault clearance is essential.
Key Advantages
- High-speed semiconductor protection fuse for critical DC applications.
- 450 A current rating for demanding industrial power systems.
- 750 V DC IEC voltage rating for modern power electronics.
- Ultra-fast operation helps minimise damage to expensive semiconductor devices.
- Integrated striker mechanism for fuse operation indication.
- High breaking capacity for reliable fault protection.
Key Features
- Mersen Protistor® Size 122 gR series.
- 450 A rated current.
- 750 V DC IEC rated voltage.
- 100 kA DC breaking capacity.
- Square body design with flush metric threaded terminals.
- Integrated striker for fuse status indication.
- Low I²t for superior semiconductor protection.
- Designed for railway, industrial and power conversion equipment.
Reliable Protection for Power Electronics
High-speed semiconductor fuses are specifically designed to protect sensitive power electronic components from damaging short circuits. Their extremely fast response limits fault energy, helping reduce equipment damage and minimise system downtime.
The Mersen Protistor® range is trusted worldwide across railway traction systems, industrial drives, UPS equipment, renewable energy installations and power conversion systems where dependable semiconductor protection is essential.
Typical Applications
- Semiconductor power converters.
- Railway traction and auxiliary power systems.
- Industrial DC drives.
- UPS and battery energy storage systems.
- Renewable energy inverters.
- Protection of IGBTs, thyristors and power semiconductor modules.
