Why Choose the Mersen NH4AM69V400-8 NH Fuse-Link?
The Mersen NH4AM69V400-8 is a heavy-duty DIN NH aM fuse-link engineered to provide reliable short-circuit protection for large motors and high-power motor circuits in demanding industrial environments. As part of the Mersen NH aM 690 V fuse-link series, it combines outstanding current-limiting performance with robust construction for critical motor protection applications.
Featuring an aM operating characteristic, this fuse-link is specifically designed to withstand the high inrush currents associated with motor starting whilst rapidly interrupting damaging short-circuit currents. Because an aM fuse provides partial-range protection, it should always be coordinated with an appropriate overload relay or motor protection device for complete motor protection.
With a rated current of 400 A, a rated voltage of 690 V AC, a 120 kA breaking capacity and a top indicator with live gripping lugs, the NH4AM69V400-8 is ideal for heavy industrial motor starters, motor control centres, switchgear assemblies and OEM electrical equipment.
Key Advantages
- Purpose-designed aM short-circuit protection for motor circuits.
- 400 A rated current for high-power industrial motors.
- 690 V AC operating voltage.
- 120 kA AC breaking capacity for dependable fault interruption.
- Top-mounted visual indicator for rapid fuse status identification.
- Live gripping lugs enable safe replacement using approved NH fuse pullers.
- Current-limiting performance reduces thermal and mechanical fault stress.
- Designed to DIN NH standards for compatibility with approved fuse bases.
Key Features
- Mersen NH aM 690 V fuse-link series.
- Catalogue number: NH4AM69V400-8.
- Item number: Q227990.
- Fuse size: NH4.
- 400 A rated current.
- 690 V AC rated voltage.
- aM motor protection characteristic.
- Top visual indicator.
- Live gripping lugs.
- Ceramic body with knife-blade contacts.
- RoHS compliant.
Reliable Short-Circuit Protection for Large Motor Circuits
The Mersen NH4AM69V400-8 is engineered to interrupt very high short-circuit currents whilst allowing the temporary inrush currents generated during motor starting. Its current-limiting design helps reduce thermal and mechanical stress on motors, contactors and associated switchgear, improving overall system reliability.
When coordinated with an appropriate overload relay or motor protection circuit breaker, this NH4 fuse-link provides dependable protection for high-power industrial motors used in manufacturing plants, processing facilities and heavy industrial machinery.
Typical Applications
- High-power motor starters.
- Motor control centres.
- Industrial switchgear assemblies.
- Heavy industrial machinery.
- Pumps, compressors and large fans.
- Conveyor and material handling systems.
- OEM motor control equipment.
