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MERSEN FUSE 6,9 URD 3 PV 0550 6,9URD3PV550
High-speed aR characteristic fuse with double indicator and plain blades for semiconductor protection, rated 550A at 690VAC IEC / 700VAC UL.
£100.08
Why Choose the Mersen NH3UD69V550PV Protistor® Semiconductor Fuse?
The Mersen NH3UD69V550PV is a high-speed NH size 3 semiconductor fuse designed to protect sensitive power-electronic components against damaging short-circuit currents. Part of the established Mersen Protistor® range, it is intended for demanding industrial equipment incorporating IGBTs, thyristors, power diodes, rectifiers and other semiconductor devices.
Featuring an aR operating characteristic, the NH3UD69V550PV provides partial-range semiconductor protection with rapid fault interruption and effective current limitation. Its high-speed performance helps reduce peak fault current and let-through energy, limiting the electrical, thermal and mechanical stress imposed on valuable power-electronic components.
With a rated current of 550 A, a rated voltage of 690 V AC under IEC requirements and 700 V AC under UL requirements, and a robust NH size 3 format, this fuse is suitable for high-power variable frequency drives, converters, rectifiers, inverters and industrial power-control systems. Its blade-contact construction enables installation in a correctly rated compatible NH fuse base or fuse-switch disconnector.
Key Advantages
- High-speed Protistor® fuse for semiconductor protection.
- 550 A rated current for high-power industrial equipment.
- 690 V AC IEC and 700 V AC UL ratings.
- aR operating class for rapid semiconductor short-circuit protection.
- Current-limiting performance helps reduce damaging fault energy.
- Standard NH construction supports convenient maintenance and replacement.
Key Features
- Mersen Protistor® high-speed fuse range.
- 550 A rated current.
- 690 V AC IEC / 700 V AC UL rated voltage.
- aR partial-range semiconductor protection characteristic.
- NH size 3 industrial fuse format.
- Square ceramic body with plain blade contacts.
- Low let-through energy during short-circuit conditions.
- Suitable for high-power drives, converters and semiconductor assemblies.
Reliable Protection for High-Power Electronics
Power-semiconductor devices can be permanently damaged by fault energy before a conventional general-purpose fuse has time to operate. The Mersen NH3UD69V550PV is engineered to clear high fault currents rapidly while limiting the peak current and total energy transmitted to the protected circuit.
Its aR characteristic is intended specifically for short-circuit protection rather than full-range overload protection. The fuse should therefore be coordinated with suitable overload protection and selected according to the equipment manufacturer's requirements, operating current, system voltage and prospective short-circuit current.
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.
- Industrial automation and OEM machinery.
Technical Specifications
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| Fuse Indication | Dual indicator | |
|---|---|---|
| Fuse Type | PV (gPV), Semiconductor | |
| Fuse Size | NH3 | |
| Fuse Class | aR | |
| Voltage | 690 V | |
| Item number | Q320588 | |
| Catalogue No | NH3UD69V550PV | |
| Description | Square Body High-Speed Fuse Protistor® NH Size 3 aR 690VAC IEC 700VAC UL 550A With Double indicator Plain Blades | |
| EAN/UPC Code | 3605340358667 | |
| Rated voltage AC UL | 700 V | |
| Rated voltage AC IEC | 690 V | |
| Ampere Rating | 550 A | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | NH3 | |
| Mounting | Clip | |
| Clearing I2t At Rated Voltage | 163 kA²s | |
| Melting I2t | 30.3 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 | 160 W | |
| HS Code | 85361090 | |
| Country of Manufacture | Tunisia |
Frequently Asked Questions
What is the Mersen NH3UD69V550PV used for?
It provides high-speed short-circuit protection for semiconductor devices installed in high-power drives, converters, rectifiers, inverters and other industrial power-electronic equipment.
What is the current rating of this fuse?
The Mersen NH3UD69V550PV has a rated current of 550 A.
What voltage is the NH3UD69V550PV rated for?
The fuse is rated at 690 V AC under IEC requirements and 700 V AC under UL requirements.
What does the aR operating class mean?
The aR classification identifies a partial-range, high-speed fuse intended to protect semiconductor devices against short-circuit currents. Separate overload protection is normally required.
Can this fuse be replaced with any 550 A NH fuse?
No. A suitable replacement must also match the required voltage rating, operating class, NH size, terminal arrangement, breaking capacity and time-current performance. Use the exact manufacturer reference wherever specified by the equipment manufacturer.
Where is this fuse typically installed?
It is typically installed in a compatible NH fuse base or fuse-switch disconnector within high-power industrial control panels, drive systems and power-conversion equipment.
Trusted Semiconductor Protection for Industrial Systems
Mersen Protistor® fuses are widely specified for critical power-electronic equipment where rapid fault interruption, effective current limitation and dependable industrial performance are essential.
