Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
MERSEN FUSE NH 3 400A 690V AM NH3AM69V400
Mersen NH3AM69V400 DIN NH3 aM fuse-link rated 400 A and 690 V AC with double indicator and live gripping lugs for industrial motor circuit protection.
£43.41
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.
Technical Specifications
Tick the specs you need, then view products that match.
| Fuse Indication | Dual indicator | |
|---|---|---|
| Current | 400 A | |
| Voltage | 690 V | |
| Device Type | Fuse link | |
| Fuse Type | NH (DIN) | |
| Fuse Size | NH3 | |
| Fuse Class | aM | |
| Manufacturer | Mersen | |
| Series | NH Fuse-Links aM 690 VAC | |
| Model | NH3AM69V400 | |
| Item number | H227983 | |
| Product type | DIN NH motor protection fuse-link | |
| Fuse size | NH3 | |
| Utilisation category | aM | |
| Rated current | 400 A | |
| Rated AC voltage | 690 V AC | |
| Breaking capacity | 80 kA AC | |
| Current type | AC | |
| Contact type | Blade contacts | |
| Indicator | Double indicator | |
| Gripping lugs | Live tags | |
| Body width | 71.9 mm | |
| Weight | Approx. 1.05 kg | |
| Power dissipation | 29.1 W | |
| Compliance | IEC 60269, RoHS compliant | |
| HS Code | 85361090 | |
| Country of Manufacture | Hungary |
Frequently Asked Questions
What is the Mersen NH3AM69V400 used for?
The NH3AM69V400 provides short-circuit protection for motors, motor starters and associated industrial motor circuits.
What is the current rating of this fuse-link?
This NH fuse-link has a 400 A rated current.
What voltage is the NH3AM69V400 designed for?
The fuse-link is rated for operation on 690 V AC electrical systems.
What does the aM classification mean?
The aM utilisation category identifies a motor protection fuse-link that provides short-circuit protection whilst allowing normal motor starting currents to pass without nuisance operation.
Does this fuse provide overload protection?
No. An aM fuse-link must always be used together with a suitable overload relay or motor protection device to provide complete motor protection.
Trusted by Electrical Professionals Worldwide
Mersen NH aM fuse-links are trusted by panel builders, OEMs, electrical contractors and maintenance engineers for dependable motor circuit protection in demanding industrial environments.
