Why Choose the Mersen NH1AM50V250 NH Fuse-Link?
The Mersen NH1AM50V250 is a high-performance DIN NH size 1 aM fuse-link designed specifically for short-circuit protection in motor circuits and other industrial loads with high starting currents. Rated at 250 A and 500 V AC, it is suitable for motor control centres, heavy machinery, pumps, compressors, conveyors and industrial production equipment.
Its aM operating characteristic allows the fuse-link to withstand the temporary inrush currents produced when electric motors start while responding rapidly to severe short-circuit faults. As an aM partial-range fuse-link, it must be coordinated with a suitable overload protection device, such as a thermal overload relay or electronic motor protection relay.
The NH1AM50V250 features a robust ceramic body, silver-plated copper blade contacts, live gripping lugs and a double indication system. Its standard NH1 construction provides compatibility with suitable NH fuse bases and fuse-switch disconnectors while delivering reliable fault interruption in demanding industrial environments.
Key Advantages
- Purpose-designed for motor circuit short-circuit protection.
- 250 A rated current for demanding industrial motor applications.
- 500 V AC rated voltage.
- aM characteristic tolerates normal motor starting currents.
- High 120 kA AC breaking capacity.
- Double indicator assists with rapid fuse status identification.
- Live gripping lugs support handling with an approved NH fuse puller.
Key Features
- Mersen DIN NH aM fuse-link.
- Catalogue number: NH1AM50V250.
- Manufacturer item number: J232515.
- Fuse size: NH1.
- Rated current: 250 A.
- Rated voltage: 500 V AC.
- Utilisation category: aM.
- Integrated double indication system.
- Live metal gripping lugs.
- Silver-plated copper plain blade terminals.
Reliable Protection for Industrial Motor Circuits
Electric motors can draw several times their normal operating current during start-up. The aM characteristic enables the Mersen NH1AM50V250 to tolerate these temporary starting currents without unnecessary operation while rapidly interrupting high short-circuit currents that could damage motors, cables and switching equipment.
Because the NH1AM50V250 is a partial-range fuse-link, it does not independently provide protection against sustained motor overloads. It must therefore be used with a correctly selected overload relay or motor protection device to provide coordinated protection throughout the motor circuit.
Typical Applications
- Industrial motor control centres.
- Three-phase motor feeder circuits.
- Pumps, fans and compressor systems.
- Conveyors and materials handling equipment.
- Manufacturing and processing machinery.
- NH1 fuse bases and fuse-switch disconnectors.
