Why Choose the Mersen NH3AM69V355 NH Fuse-Link?
The Mersen NH3AM69V355 is a high-performance DIN NH aM fuse-link designed to provide dependable short-circuit protection for motors, motor starters and associated industrial electrical equipment. Part of Mersen's established NH aM 690 V AC fuse-link range, it is engineered for demanding motor circuits where reliable fault interruption and high current-limiting performance are essential.
The aM operating characteristic is specifically intended for motor protection applications. It allows the fuse-link to withstand the temporary inrush currents associated with motor starting while rapidly interrupting damaging short-circuit currents. As an aM partial-range fuse-link, it must be coordinated with a suitable overload relay or motor protection device.
Featuring a 355 A rated current, 690 V AC rated voltage and an NH3 body size, the NH3AM69V355 is suitable for high-power motors used in manufacturing, processing, pumping and material-handling systems. Its ceramic body, silver-plated copper blade contacts, double indicator and live gripping lugs support dependable operation and efficient maintenance.
Key Advantages
- Designed specifically for industrial motor short-circuit protection.
- 355 A rated current for high-power motor circuits.
- 690 V AC rated operation.
- aM characteristic accommodates normal motor starting currents.
- 80 kA AC breaking capacity for reliable fault interruption.
- Double indicator enables rapid identification of an operated fuse.
Key Features
- Mersen NH aM 690 V AC fuse-link series.
- Catalogue number: NH3AM69V355.
- Item number: G227982.
- NH3 fuse size.
- 355 A rated current.
- 690 V AC rated voltage.
- aM partial-range motor protection characteristic.
- 80 kA maximum AC breaking capacity.
- Double fuse operation indicator.
- Live gripping lugs.
- Silver-plated copper plain blade contacts.
- High-strength ceramic insulating body.
Reliable Short-Circuit Protection for High-Power Motors
The Mersen NH3AM69V355 is designed to interrupt high prospective fault currents rapidly while allowing the temporary current peaks produced during normal motor starting. This helps prevent nuisance fuse operation while protecting motors, contactors, cables and associated switchgear against severe short-circuit damage.
Because an aM fuse-link provides partial-range protection, a correctly selected overload relay or motor protection circuit breaker is required to protect against sustained overload conditions. Coordinating these devices provides comprehensive protection for demanding industrial motor circuits.
Typical Applications
- Industrial motor control centres.
- High-power motor starters.
- Pumps, compressors and ventilation systems.
- Conveyors and material-handling equipment.
- Manufacturing and processing machinery.
- OEM automation and machine-building applications.
