Why Choose the Mersen NH3AM69V250 NH Fuse-Link?
The Mersen NH3AM69V250 is a high-performance DIN NH size 3 aM fuse-link designed specifically for short-circuit protection of industrial motor circuits. Rated at 250 A and 690 V AC, it delivers excellent current-limiting performance to safeguard motors, contactors, motor starters and associated switchgear against damaging fault currents.
Featuring an aM partial-range operating characteristic, the NH3AM69V250 is engineered to tolerate the high inrush currents generated during motor starting while providing rapid interruption of severe short-circuit faults. As with all aM fuse-links, it should be coordinated with a suitable overload relay or motor protection device, as overload protection is provided separately.
The fuse-link incorporates a robust ceramic body, silver-plated blade contacts, live gripping lugs and a double fuse-operation indicator. Manufactured to the DIN NH standard, it is suitable for installation in compatible NH fuse bases and switch-fuse disconnectors throughout industrial motor control systems.
Key Advantages
- Purpose-designed aM short-circuit protection for motor circuits.
- 250 A rated current for demanding industrial applications.
- 690 V AC operating voltage.
- 80 kA AC breaking capacity for dependable fault interruption.
- Allows normal motor starting currents without nuisance operation.
- Double indication system enables rapid fuse status identification.
Key Features
- Mersen NH aM 690 V fuse-link series.
- DIN NH size 3.
- 250 A rated current.
- 690 V AC rated voltage.
- Partial-range aM operating characteristic.
- Designed for motor circuit short-circuit protection.
- Double blown-fuse indicator.
- Live, non-isolated gripping lugs.
- Silver-plated copper blade contacts.
- Robust ceramic insulating body.
Reliable Short-Circuit Protection for Motor Circuits
Industrial motors can generate substantial inrush currents during starting. The Mersen NH3AM69V250 is specifically designed to tolerate these temporary currents while rapidly interrupting high-energy short-circuit faults, helping minimise damage to motors and associated electrical equipment.
As an aM fuse-link, the NH3AM69V250 should always be installed alongside a suitable overload protection device. Installation and replacement should only be carried out by qualified electrical professionals using approved NH fuse handling equipment.
Typical Applications
- Industrial motor control centres.
- Direct-on-line motor starters.
- Star-delta motor starter assemblies.
- Industrial pumps, compressors and fans.
- Conveyor and material handling equipment.
- Manufacturing machinery.
- Industrial automation systems.
