Why Choose the Mersen T302122 Semiconductor Fuse?
The Mersen T302122 is a high-speed aR semiconductor protection fuse designed to protect power semiconductor devices against short-circuit faults in demanding industrial applications. This square body fuse is rated at 690 VAC with a 450 A current rating and features a Size 31 body with DSI blade terminals and an integrated striker (percussor), making it suitable for protecting variable speed drives, UPS systems, soft starters, converters and other semiconductor-based equipment.
As part of Mersen's renowned Protistor® semiconductor fuse range, the T302122 offers extremely fast fault clearing characteristics to minimise let-through energy and protect expensive semiconductor devices such as IGBTs, SCRs, diodes and thyristors from catastrophic failure. Its aR utilisation category provides partial-range protection specifically developed for semiconductor applications.
The Mersen T302122 is ideal for OEM equipment, industrial maintenance and replacement applications where the original manufacturer specifies this exact part number. Always verify the required electrical ratings and mechanical dimensions before installation.
Key Advantages
- Genuine Mersen Protistor® semiconductor protection fuse.
- High-speed aR characteristic for semiconductor protection.
- Rated 450 A.
- Rated operating voltage of 690 VAC.
- Helps protect IGBTs, SCRs, thyristors and power semiconductor devices.
- Integrated striker (percussor) for fuse operation indication.
Key Features
- Manufacturer: Mersen
- Part number: T302122
- High-speed semiconductor protection fuse.
- Utilisation category: aR.
- Rated current: 450 A.
- Rated voltage: 690 VAC.
- Square body Size 31 construction.
- DSI blade terminal configuration.
- Integrated striker (percussor).
- Designed for protection of semiconductor devices.
Designed for Semiconductor Protection
Power electronic equipment requires protection capable of interrupting extremely high fault currents before semiconductor junctions become damaged. High-speed semiconductor fuses provide exceptionally low let-through energy, helping to reduce repair costs and improve equipment availability.
The Mersen T302122 is suitable for applications including AC drives, DC drives, UPS equipment, rectifiers, inverters, industrial converters, renewable energy systems and motor control equipment where rapid semiconductor protection is essential.
Typical Applications
- Variable speed drives.
- Motor drives and soft starters.
- Industrial inverters.
- UPS systems.
- Power converters and rectifiers.
- Semiconductor protection panels.
- Renewable energy power conversion equipment.
- OEM industrial machinery.
