Why Choose the Mersen NH3AM69V400 NH Fuse-Link?
The Mersen NH3AM69V400 is a high-performance DIN NH aM low voltage fuse-link engineered to provide reliable short-circuit protection for motors, motor starters and industrial power circuits. Manufactured by Mersen, this NH3 fuse-link is specifically designed for motor applications where high starting currents must be accommodated without unnecessary fuse operation.
Part of the trusted Mersen NH aM 690 V AC fuse-link series, the NH3AM69V400 features a 400 A current rating, 690 V AC operating voltage and an 80 kA AC breaking capacity. Its aM utilisation category provides dependable short-circuit protection whilst allowing normal motor starting currents to pass without nuisance operation.
The fuse-link incorporates live gripping lugs, a double indicator and standard NH blade contacts for installation in compatible NH3 fuse bases. Its robust ceramic construction ensures long service life in industrial motor control centres, switchboards and machinery panels.
Key Advantages
- Purpose-designed aM fuse-link for motor circuit protection.
- 400 A rated current for demanding industrial motor applications.
- 690 V AC operating voltage.
- Designed to withstand normal motor starting currents.
- Provides rapid protection against high-level short-circuit faults.
- 80 kA AC breaking capacity.
- Double indicator enables rapid identification of an operated fuse-link.
- Live gripping lugs support safe replacement using an approved NH fuse puller.
Key Features
- Mersen NH aM 690 VAC fuse-link series.
- Catalogue number: NH3AM69V400.
- Mersen item number: H227983.
- Fuse size: NH3.
- Rated current: 400 A.
- Rated voltage: 690 V AC.
- aM utilisation category.
- 80 kA AC breaking capacity.
- Double operated-fuse indicator.
- Live gripping lugs.
- Standard NH blade contacts.
- Body width: 71.9 mm.
Reliable Protection for Industrial Motor Circuits
The Mersen NH3AM69V400 is engineered to protect motors and motor feeders against damaging short-circuit currents. Its aM operating characteristic allows it to withstand temporary current peaks generated during motor starting whilst providing rapid interruption when serious fault conditions occur.
As an aM partial-range fuse-link, the NH3AM69V400 does not provide overload protection independently. It should always be coordinated with a suitable overload relay or motor protection circuit breaker to provide complete motor protection.
Typical Applications
- Industrial motor control centres.
- Direct-on-line motor starters.
- Star-delta motor starter assemblies.
- Pumps, fans and compressor systems.
- Conveyor and material handling equipment.
- OEM machinery and industrial automation systems.
