Why Choose the Mersen NH2AM69V400 Motor Protection Fuse?
The Mersen NH2AM69V400 is a high-performance DIN NH aM fuse link designed specifically for short-circuit protection in industrial motor circuits. Its partial-range aM operating characteristic allows normal motor starting currents to pass without unnecessary fuse operation while providing rapid interruption of damaging short-circuit currents.
Part of the established Mersen NH aM 690 V fuse-link range, the NH2AM69V400 features a durable ceramic body, blade contacts, live gripping lugs and a double indicator. The indication system helps qualified maintenance personnel identify an operated fuse quickly, supporting efficient fault diagnosis and replacement.
With a rated current of 400 A, a rated voltage of 690 V AC and an NH Size 2 format, this fuse link is suitable for high-power motors, motor control centres and industrial machinery. As an aM fuse, it must be coordinated with a suitable overload relay or motor protection device to provide complete protection.
Key Advantages
- Purpose-designed aM fuse link for motor circuit protection.
- 400 A rated current for high-power industrial applications.
- 690 V AC voltage rating for demanding motor systems.
- Strong current-limiting performance during short-circuit faults.
- Double indicator enables rapid identification after operation.
- Standard NH Size 2 construction for compatible fuse equipment.
Key Features
- Mersen NH aM 690 V fuse-link series.
- 400 A rated current.
- 690 V AC rated voltage.
- NH Size 2 construction.
- Partial-range aM utilisation category.
- Designed for short-circuit protection of motor circuits.
- Live, non-isolated gripping lugs.
- Integrated double fuse-operation indicator.
- Low power-loss, current-limiting design.
- RoHS-compliant construction.
Reliable Short-Circuit Protection for High-Power Motors
The Mersen NH2AM69V400 is designed to tolerate the temporary inrush currents generated when industrial motors start. Its aM characteristic interrupts currents from approximately 6.3 times the fuse's rated current up to its maximum breaking capacity, providing effective short-circuit protection without responding unnecessarily during normal motor acceleration.
Because an aM fuse link does not provide overload protection, it should be used alongside a correctly selected overload relay, motor protection circuit breaker or equivalent protective device. This coordinated arrangement helps protect motors, contactors, cables and starter components against both overload and short-circuit conditions.
Typical Applications
- High-power industrial motor circuits.
- Motor control centres and control panels.
- Direct-on-line and star-delta motor starters.
- Pumps, compressors and ventilation equipment.
- Conveyors and materials-handling systems.
- OEM production and processing machinery.
