Why Choose the Mersen NH3AM69V450 Motor Protection Fuse-Link?
The Mersen NH3AM69V450 is a heavy-duty DIN NH aM fuse-link engineered to provide dependable short-circuit protection for motors, motor starters and industrial power circuits. Its aM operating characteristic is specifically designed for motor applications, allowing normal starting currents while providing rapid interruption of damaging fault currents.
As part of Mersen's NH aM 690 V AC fuse-link range, the NH3AM69V450 combines high current-limiting performance with a robust ceramic construction to help protect contactors, switchgear and cabling from excessive thermal and mechanical stress. The integrated double indication system enables maintenance personnel to quickly identify an operated fuse-link, helping reduce downtime.
Rated at 450 A and 690 V AC, this NH3 fuse-link features live gripping lugs, silver-plated copper blade contacts and a durable ceramic body. As an aM fuse-link, it provides short-circuit protection only and must be installed with a suitable overload protection device, such as a thermal overload relay or motor protection circuit breaker.
Key Advantages
- Purpose-designed aM motor protection fuse-link.
- 450 A rated current for demanding industrial motor circuits.
- 690 V AC rated operating voltage.
- 80 kA AC breaking capacity for dependable fault interruption.
- Current-limiting design reduces stress on downstream equipment.
- Double indicator enables rapid identification of an operated fuse-link.
- Low power dissipation supports efficient motor protection.
Key Features
- Mersen NH aM 690 V AC fuse-link series.
- DIN NH3 fuse size.
- 450 A rated current.
- 690 V AC rated voltage.
- aM partial-range operating characteristic.
- 80 kA AC breaking capacity.
- Double fuse operation indicator.
- Live gripping lugs.
- Silver-plated copper blade terminals.
- Durable ceramic insulating body.
- 71.9 mm body width.
Reliable Short-Circuit Protection for Motor Circuits
Motor circuits generate high inrush currents during starting, requiring protective devices that tolerate these temporary conditions without nuisance operation. The Mersen NH3AM69V450 is specifically engineered to withstand motor starting currents while providing rapid interruption of severe short-circuit faults.
Because this is an aM partial-range fuse-link, it must always be used together with correctly selected overload protection. Combined with an overload relay or motor protection circuit breaker, it provides comprehensive protection for industrial motors and associated electrical equipment.
Typical Applications
- Industrial motor starter circuits.
- Motor control centres.
- Contactors with thermal overload relays.
- Pumps, compressors and conveyor systems.
- Heavy industrial machinery.
- NH3 fuse bases and fuse-switch disconnectors.
