Why Choose the Mersen NH3AM69V300 NH Fuse-Link?
The Mersen NH3AM69V300 is a robust NH size 3 aM fuse-link designed to provide dependable short-circuit protection for high-power industrial motors and associated electrical equipment. Rated at 300 A and 690 V AC, it is suitable for demanding motor control centres, industrial switchboards and low-voltage power distribution systems.
As an aM partial-range fuse-link, the NH3AM69V300 is specifically engineered for motor circuit protection. Its strong current-limiting performance helps reduce the thermal and mechanical stresses caused by short-circuit currents, protecting cables, contactors and other downstream components. Separate overload protection must be installed to provide complete motor protection.
The fuse-link features a durable ceramic body, standard NH blade contacts, live gripping lugs and a double indication system for convenient fuse status identification. Its DIN-standard NH3 construction allows installation in compatible fuse bases and switch-fuse equipment used throughout industrial electrical installations.
Key Advantages
- Reliable short-circuit protection for high-power industrial motors.
- 300 A current rating for demanding motor control applications.
- 690 V AC rated voltage for industrial power networks.
- Strong current-limiting performance helps minimise equipment damage.
- Low power losses support efficient electrical system operation.
- Double indication provides clear identification of fuse operation.
- Live gripping lugs support handling with an approved NH fuse puller.
Key Features
- Mersen NH aM motor-circuit fuse-link series.
- NH3 fuse size.
- 300 A rated current.
- 690 V AC rated voltage.
- aM partial-range operating characteristic.
- Double visual indication system.
- Live, non-isolated gripping lugs.
- DIN-standard blade contact design.
- Durable ceramic insulating body.
- Dimensions manufactured in accordance with DIN NH requirements.
Reliable Protection for High-Power Motor Circuits
The Mersen NH3AM69V300 is designed to interrupt damaging short-circuit currents before they can cause serious thermal or mechanical damage to motors, cables, contactors and switchgear. Its current-limiting characteristics reduce the energy passed through to downstream equipment during an electrical fault.
As an aM fuse-link, the NH3AM69V300 is intended for short-circuit protection only. It must be used with a correctly selected overload relay, motor protection circuit breaker or equivalent protective device. Installation and replacement should only be undertaken by qualified electrical personnel using compatible NH equipment.
Typical Applications
- High-power industrial motor circuits.
- Motor control centres and industrial switchboards.
- Pumps, fans, compressors and conveyor systems.
- Manufacturing and process automation equipment.
- Machine-building and OEM control panels.
- Industrial switch-fuse and power distribution assemblies.
