Why Choose the Mersen NH4AAM69V500-8 NH Fuse Link?
The Mersen NH4AAM69V500-8 is a heavy-duty NH4a size aM fuse link engineered to provide dependable short-circuit protection for large industrial motors, motor starters and high-power electrical equipment. Rated at 500 A and 690 V AC, it is specifically designed for demanding motor circuits where high inrush currents must be accommodated without unnecessary fuse operation.
Its aM operating characteristic is intended exclusively for motor circuit protection. The fuse withstands the temporary current peaks produced during motor start-up while rapidly interrupting dangerous short-circuit currents. As an aM fuse provides partial-range protection, it should always be used alongside a correctly selected overload relay or another suitable overload protection device.
The NH4AAM69V500-8 features a durable ceramic body, standard NH blade contacts, live gripping tags and an integrated top indicator for rapid identification of an operated fuse. Its 100 mm body width and NH4a construction allow installation in compatible heavy-duty NH fuse bases and switch disconnectors used in industrial power systems.
Key Advantages
- Purpose-designed aM short-circuit protection for high-power motor circuits.
- 500 A rated current for heavy industrial applications.
- 690 V AC operating voltage.
- 120 kA AC breaking capacity.
- Top indicator enables quick identification of an operated fuse.
- Standard NH4a construction for compatible industrial switchgear.
Key Features
- Mersen NH aM industrial fuse-link range.
- NH4a fuse size.
- 500 A rated current.
- 690 V AC rated voltage.
- aM partial-range motor protection characteristic.
- 120 kA AC breaking capacity.
- Integrated top fuse indicator.
- Live gripping tags for safe handling.
- Standard NH blade contacts.
- 100 mm body width.
Reliable Short-Circuit Protection for High-Power Motor Circuits
The Mersen NH4AAM69V500-8 is designed to protect large industrial motors and associated equipment by rapidly interrupting high fault currents while allowing normal motor starting currents to pass. Its current-limiting performance helps reduce thermal and mechanical stress on motors, cables, contactors and switchgear, improving overall system reliability.
As an aM fuse link, the NH4AAM69V500-8 does not provide complete overload protection. It must be coordinated with an appropriately selected thermal or electronic overload relay. Installation and replacement should only be carried out by qualified personnel using approved NH fuse handling equipment and suitable personal protective equipment.
Typical Applications
- Large industrial motor starters.
- Motor control centres.
- Heavy-duty pumps and compressors.
- Industrial conveyors and material handling equipment.
- Manufacturing and processing machinery.
- High-power automation systems.
