Why Choose the Mersen NH3AM69V425 NH Fuse-Link?
The Mersen NH3AM69V425 is a premium DIN NH size 3 aM fuse-link designed specifically for short-circuit protection of motor circuits and other equipment with high inrush currents. Rated at 425 A and 690 V AC, it is ideal for motor control centres, industrial switchboards, heavy machinery, compressors, pumps and manufacturing facilities operating in demanding low voltage power distribution systems.
Its aM utilisation category allows the fuse-link to withstand the temporary starting currents generated by electric motors while providing rapid interruption of high fault currents. As a partial-range motor protection fuse, it must always be used alongside an appropriate overload protection device such as a thermal overload relay or electronic motor protection relay.
The NH3AM69V425 incorporates a robust ceramic body, double indication system, live gripping lugs and silver-plated blade contacts for dependable long-term performance. Designed for installation in compatible NH size 3 fuse bases and fuse-switch disconnectors, it delivers reliable protection in demanding industrial electrical installations.
Key Advantages
- Designed specifically for motor circuit short-circuit protection.
- 425 A rated current for heavy-duty industrial applications.
- 690 V AC rated voltage.
- aM characteristic tolerates normal motor starting currents.
- 80 kA AC breaking capacity.
- Double indicator provides rapid fuse status identification.
- Live gripping lugs allow safe handling using an approved NH fuse puller.
Key Features
- Mersen DIN NH aM fuse-link.
- Catalogue number: NH3AM69V425.
- Item number: J227984.
- NH size: NH3.
- Rated current: 425 A.
- Rated voltage: 690 V AC.
- Utilisation category: aM.
- Double indication system.
- Live gripping lugs.
- High rupturing capacity motor protection fuse-link.
Reliable Protection for Heavy-Duty Motor Circuits
Industrial motors can draw several times their rated current during start-up. The Mersen NH3AM69V425 is engineered to withstand these temporary inrush currents while providing rapid interruption of genuine short-circuit faults, helping minimise equipment damage and reduce downtime in critical industrial applications.
As an aM partial-range fuse-link, the NH3AM69V425 must always be coordinated with a suitable overload protection device. When correctly selected, it provides dependable protection for large motors, motor starters and industrial control equipment.
Typical Applications
- Motor control centres.
- Large three-phase motor feeder circuits.
- Industrial pumps and compressors.
- Heavy-duty conveyors.
- Manufacturing and processing plants.
- NH size 3 fuse bases and fuse-switch disconnectors.
