Why Choose the Mersen NH4AAM69V630-8 Motor Protection Fuse?
The Mersen NH4AAM69V630-8 is a high-capacity DIN NH aM fuse-link designed to provide dependable short-circuit protection for industrial motors, motor starters and associated switching equipment. Manufactured by Mersen, this NH4a fuse-link offers strong current-limiting performance while accommodating the temporary inrush currents generated during motor starting.
The specialised aM operating characteristic makes the NH4AAM69V630-8 suitable for demanding motor control applications where overload protection is provided separately by a thermal overload relay or electronic motor protection device. Its ceramic body, silver-plated copper terminals and plain blade contacts provide reliable electrical and mechanical performance in heavy industrial environments.
With a rated current of 630 A, a rated voltage of 690 V AC and a high 120 kA breaking capacity, the NH4AAM69V630-8 is ideal for large motor control centres, industrial switchboards and heavy machinery. Its live gripping lugs and integrated top indicator support efficient handling, maintenance and fault identification in compatible NH fuse systems.
Key Advantages
- Heavy-duty aM fuse-link for industrial motor circuit protection.
- 630 A rated current for high-power motor applications.
- 690 V AC voltage rating for industrial electrical systems.
- 120 kA breaking capacity for reliable short-circuit interruption.
- Strong current-limiting performance helps protect cables and switching equipment.
- Integrated top indicator enables rapid identification after operation.
Key Features
- Mersen NH aM 690 V AC fuse-link series.
- DIN NH Size 4a construction.
- 630 A rated current.
- 690 V AC rated voltage.
- aM partial-range motor protection characteristic.
- 120 kA AC breaking capacity.
- Live, non-isolated gripping lugs.
- Top-mounted visual operation indicator.
Reliable Short-Circuit Protection for High-Power Motors
The Mersen NH4AAM69V630-8 is designed to interrupt high fault currents while allowing the elevated current normally drawn during motor acceleration. Its current-limiting operation helps reduce thermal and electrodynamic stress on contactors, cables, switchgear and other components connected to the motor circuit.
As an aM partial-range fuse-link, the NH4AAM69V630-8 provides short-circuit protection only and must be coordinated with a suitable overload relay. This combination delivers effective protection for high-power motors while reducing the risk of nuisance fuse operation during normal starting conditions.
Typical Applications
- High-power industrial electric motors.
- Motor control centres and starter panels.
- Heavy manufacturing and processing machinery.
- Pumps, compressors, conveyors and large fans.
- Industrial switchboards and power distribution systems.
- OEM machinery and automation control panels.
