The NH3UD69V400PV delivers rapid, reliable overcurrent protection for demanding industrial and renewable applications, with high interrupting capacity up to 690 VAC (IEC) and 700 VAC (UL). Double indicator technology allows for quick visual status checks, reducing downtime and maintenance effort.
£158.30
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.
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.
| Item number | K320583 |
|---|---|
| Catalogue No | NH3UD69V400PV |
| Description | Square Body High-Speed Fuse Protistor® NH Size 3 aR 690VAC IEC 700VAC UL 400A With Double indicator Plain Blades |
| EAN/UPC Code | 3605340358582 |
| Rated voltage AC UL | 700 V |
| Rated voltage AC IEC | 690 V |
| Ampere Rating | 400 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | NH3 |
| Mounting | Clip |
| Clearing I2t At Rated Voltage | 56.5 kA²s |
| Melting I2t | 10.5 kA²s |
| AC Max I.R./Breaking Capacity | I1: 170 kA |
| Indication System | Yes |
| Indication System Type | Double indicator |
| Connection/Terminal Material | Brass |
| Connection/Terminal Type | Plain Blades |
| Product Width | 72 mm |
| Product Length | 150 mm |
| Product Height | 89 mm |
| Sell Pack Quantity | 1 EA |
| Sell Pack Weight | 1.05 kg |
| Sell Pack Width | 165 mm |
| Sell Pack Length | 185 mm |
| Sell Pack Height | 100 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 1.05 kg |
| Power Dissipation at Rated Current Value | 130 W |
| HS Code | 85361090 |
| Country of Manufacture | Tunisia |
The Mersen NH3UD69V400PV is used to protect semiconductor devices and power electronic equipment against damaging short-circuit currents.
The NH3UD69V400PV has a nominal current rating of 400 A.
The fuse is designed for compatible electrical systems operating at up to 690 V AC.
The aR classification indicates a partial-range fuse designed for rapid short-circuit protection of semiconductor devices. Separate overload protection may be required elsewhere in the circuit.
The fuse is typically installed in a compatible NH Size 3 fuse base, fuse holder or switch disconnector within industrial drives, converters and other power electronic equipment.
Mersen Protistor® high-speed fuses are widely used by equipment manufacturers, control-panel builders and maintenance engineers to provide dependable protection for sensitive power electronic systems.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...