Why Choose the Mersen NH3GS69V550PV Protistor® Semiconductor Fuse?
The Mersen NH3GS69V550PV is a high-speed NH size 3 semiconductor fuse designed to protect industrial power electronics against overloads and damaging short-circuit currents. Part of the established Mersen Protistor® fuse range, it is engineered for equipment containing sensitive semiconductor devices such as IGBTs, thyristors, diodes and rectifier assemblies.
Featuring a gS operating characteristic, the NH3GS69V550PV provides full-range protection for semiconductor circuits. Its fast current-limiting performance helps reduce peak fault current and let-through energy, protecting valuable components while helping minimise equipment damage, maintenance requirements and unplanned production downtime.
With a rated current of 550 A, a rated voltage of 690 V AC and a robust NH size 3 square-body format, this fuse is suitable for high-power variable frequency drives, converters, rectifiers, inverters and industrial power-control systems. Its blade-contact design enables secure installation in compatible NH fuse bases and fuse-switch disconnectors.
Key Advantages
- High-speed fuse designed for semiconductor protection.
- 550 A rated current for high-power industrial equipment.
- 690 V AC voltage rating for demanding electrical systems.
- gS operating class provides overload and short-circuit protection.
- Effective current limitation helps reduce damaging fault energy.
- Standard NH construction supports straightforward installation and replacement.
Key Features
- Mersen Protistor® high-speed fuse range.
- 550 A rated current.
- 690 V AC rated voltage.
- gS full-range semiconductor protection characteristic.
- NH size 3 square-body format.
- Industrial blade contacts for compatible NH fuse equipment.
- Low let-through energy during fault conditions.
- Suitable for high-power drives, converters and semiconductor assemblies.
Reliable Protection for High-Power Electronics
Power semiconductor components can be damaged rapidly by excessive current and fault energy. The Mersen NH3GS69V550PV is designed to interrupt electrical faults quickly while limiting the peak current and thermal energy allowed to pass through the protected circuit.
Unlike partial-range semiconductor fuses, its gS characteristic provides protection against both overload and short-circuit conditions. This makes it suitable for coordinated protection within high-power industrial drives, converters and power distribution assemblies where equipment availability and reliable operation are essential.
Typical Applications
- High-power variable frequency drives.
- Industrial inverters and rectifiers.
- AC and DC power converters.
- Uninterruptible power supply systems.
- Motor drives and power-control assemblies.
- OEM machinery and industrial automation equipment.
