Why Choose the Mersen NH3UD69V400PV High-Speed Semiconductor Fuse?
The Mersen NH3UD69V400PV is a high-performance NH Size 3 high-speed semiconductor fuse link designed to protect sensitive power electronic equipment against damaging short-circuit currents. As part of the established Mersen Protistor® fuse range, it provides rapid fault interruption for semiconductor devices used in industrial drives, converters, rectifiers and power-control systems.
Semiconductor components such as IGBTs, thyristors and diodes can be damaged extremely quickly during an electrical fault. The NH3UD69V400PV is engineered with fast-acting current-limiting characteristics that reduce the energy allowed to pass through the circuit, helping protect valuable electronic components and minimise equipment downtime.
With a rated current of 400 A, an operating voltage of 690 V AC and a robust NH Size 3 blade-contact format, this fuse is suitable for demanding industrial power-conversion applications. Its standardised construction enables installation in compatible NH fuse bases, fuse holders and switch-disconnector assemblies.
Key Advantages
- High-speed semiconductor fuse designed for power electronic protection.
- 400 A rated current suitable for high-power industrial equipment.
- 690 V AC operating voltage for compatible power systems.
- Rapid fault interruption helps limit damaging let-through energy.
- High breaking capacity supports safe isolation of severe short circuits.
- Standard NH Size 3 blade-contact design for straightforward installation.
Key Features
- Mersen Protistor® NH3UD69V400PV fuse link.
- 400 A nominal current rating.
- 690 V AC IEC voltage rating.
- aR utilisation category for semiconductor short-circuit protection.
- NH Size 3 square-body construction.
- Fast current-limiting operating characteristics.
- Blade contacts for compatible industrial fuse assemblies.
- Suitable for converters, drives, rectifiers and power-control equipment.
Reliable Protection for High-Power Electronics
High-speed semiconductor fuses operate more rapidly than general-purpose industrial fuses. Their specialised fuse elements interrupt short-circuit currents before excessive thermal energy can damage sensitive semiconductor devices or associated power electronic assemblies.
The Mersen NH3UD69V400PV is intended for circuits where rapid fault clearing and low let-through energy are essential. As an aR-class fuse, it provides partial-range short-circuit protection and should be used with suitable separate protection against sustained overload conditions where required by the system design.
Typical Applications
- Variable frequency drives and industrial motor drives.
- Power converters and inverter systems.
- Industrial rectifiers and controlled rectifier equipment.
- Uninterruptible power supply systems.
- Soft starters and high-power motor-control equipment.
- Protection of IGBTs, thyristors, diodes and semiconductor modules.
