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MERSEN FUSE NH 4A 630A 690V AM NH4AAM69V630-8
Mersen NH4AAM69V630-8 DIN NH4a aM fuse-link rated at 630 A and 690 V AC with a 120 kA breaking capacity for short-circuit protection of high-power industrial motor circuits.
£109.67
Why Choose the Mersen NH4AAM69V630-8 Motor Protection Fuse?
The Mersen NH4AAM69V630-8 is a high-capacity DIN NH aM fuse-link designed to provide dependable short-circuit protection for industrial motors, motor starters and associated switching equipment. Manufactured by Mersen, this NH4a fuse-link offers strong current-limiting performance while accommodating the temporary inrush currents generated during motor starting.
The specialised aM operating characteristic makes the NH4AAM69V630-8 suitable for demanding motor control applications where overload protection is provided separately by a thermal overload relay or electronic motor protection device. Its ceramic body, silver-plated copper terminals and plain blade contacts provide reliable electrical and mechanical performance in heavy industrial environments.
With a rated current of 630 A, a rated voltage of 690 V AC and a high 120 kA breaking capacity, the NH4AAM69V630-8 is ideal for large motor control centres, industrial switchboards and heavy machinery. Its live gripping lugs and integrated top indicator support efficient handling, maintenance and fault identification in compatible NH fuse systems.
Key Advantages
- Heavy-duty aM fuse-link for industrial motor circuit protection.
- 630 A rated current for high-power motor applications.
- 690 V AC voltage rating for industrial electrical systems.
- 120 kA breaking capacity for reliable short-circuit interruption.
- Strong current-limiting performance helps protect cables and switching equipment.
- Integrated top indicator enables rapid identification after operation.
Key Features
- Mersen NH aM 690 V AC fuse-link series.
- DIN NH Size 4a construction.
- 630 A rated current.
- 690 V AC rated voltage.
- aM partial-range motor protection characteristic.
- 120 kA AC breaking capacity.
- Live, non-isolated gripping lugs.
- Top-mounted visual operation indicator.
Reliable Short-Circuit Protection for High-Power Motors
The Mersen NH4AAM69V630-8 is designed to interrupt high fault currents while allowing the elevated current normally drawn during motor acceleration. Its current-limiting operation helps reduce thermal and electrodynamic stress on contactors, cables, switchgear and other components connected to the motor circuit.
As an aM partial-range fuse-link, the NH4AAM69V630-8 provides short-circuit protection only and must be coordinated with a suitable overload relay. This combination delivers effective protection for high-power motors while reducing the risk of nuisance fuse operation during normal starting conditions.
Typical Applications
- High-power industrial electric motors.
- Motor control centres and starter panels.
- Heavy manufacturing and processing machinery.
- Pumps, compressors, conveyors and large fans.
- Industrial switchboards and power distribution systems.
- OEM machinery and automation control panels.
Technical Specifications
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| Current | 630 A | |
|---|---|---|
| Voltage | 690 V | |
| Device Type | Fuse link | |
| Fuse Type | NH (DIN) | |
| Fuse Size | NH4a | |
| Fuse Class | aM | |
| Manufacturer | Mersen | |
| Series | NH Fuse-links aM 690 VAC | |
| Model | NH4AAM69V630-8 | |
| Manufacturer item number | Y227997 | |
| Product type | DIN NH motor protection fuse-link | |
| Fuse size | NH4a | |
| Rated current | 630 A | |
| Rated voltage | 690 V AC | |
| Operating characteristic | aM | |
| Protection range | Partial-range short-circuit protection | |
| Breaking capacity | 120 kA AC | |
| Current type | AC | |
| Mounting type | Clip mounting | |
| Indicator type | Top indicator | |
| Gripping lugs | Live, non-isolated | |
| Terminal type | Plain blades | |
| Terminal material | Silver-plated copper | |
| Body material | Ceramic | |
| Dimensions (L × W × H) | 200 × 100 × 123.5 mm | |
| Power dissipation at rated current | 50 W | |
| Weight | Approx. 2.2 kg | |
| EAN / UPC | 8430399027821 | |
| Standards | IEC 60269-1, IEC 60269-2 and VDE 0636 Part 201 | |
| RoHS compliant | Yes | |
| HS Code | 85361090 | |
| Country of Manufacture | Hungary |
Frequently Asked Questions
What is the Mersen NH4AAM69V630-8 used for?
This fuse-link provides short-circuit protection for high-power industrial motors, motor starters, contactors and associated electrical equipment.
What is the current rating of this fuse-link?
The NH4AAM69V630-8 has a rated current of 630 A.
What voltage is supported by this fuse?
The fuse-link is designed for motor circuits operating at up to 690 V AC.
What does the aM characteristic mean?
The aM characteristic identifies a partial-range motor fuse that allows normal starting currents while providing high-capacity short-circuit protection.
Does this fuse-link provide overload protection?
No. The NH4AAM69V630-8 must be used with a correctly selected overload relay or electronic motor protection device.
Trusted for Heavy Industrial Motor Protection
Mersen NH aM fuse-links are widely specified by electrical engineers, machinery manufacturers and panel builders for dependable short-circuit protection, strong current limitation and reliable performance in high-power motor control systems.
