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MERSEN FUSE NH 4 800A 690V AM NH4AM69V800-8
Mersen NH4AM69V800-8 DIN NH4 aM motor fuse link rated at 800 A and 690 V AC with top indicator and live gripping lugs for industrial motor short-circuit protection.
£109.67
Why Choose the Mersen NH4AM69V800-8 Motor Fuse Link?
The Mersen NH4AM69V800-8 is a heavy-duty DIN NH aM fuse link designed specifically for short-circuit protection in high-power industrial motor circuits. Manufactured by Mersen, this NH Size 4 fuse link delivers exceptional current-limiting performance, protecting large motors, motor starters, contactors and associated electrical equipment from damaging fault currents while maintaining reliable operation in demanding industrial environments.
With a rated current of 800 A and a 690 V AC voltage rating, the NH4AM69V800-8 is engineered to withstand the high inrush currents associated with motor starting while providing rapid interruption of severe short-circuit faults. Its aM operating class makes it ideal for motor protection systems that incorporate a separate overload relay or motor protection circuit breaker.
Manufactured in the standard NH Size 4 format, this fuse link features blade contacts, live gripping lugs and a top-mounted operation indicator. Its robust ceramic construction, high breaking capacity and compliance with IEC standards make it suitable for heavy industrial motor control centres, switchgear and low-voltage power distribution systems.
Key Advantages
- Designed specifically for industrial motor short-circuit protection.
- 800 A rated current for large motor applications.
- 690 V AC rated voltage for demanding industrial power systems.
- High current-limiting performance helps minimise fault energy.
- Designed to withstand normal motor starting currents.
- Top-mounted indicator enables rapid identification of fuse operation.
- Live gripping lugs support safe replacement using approved NH fuse handling tools.
Key Features
- Mersen NH fuse-links aM 690 VAC series.
- NH Size 4.
- 800 A rated current.
- 690 V AC rated voltage.
- Partial-range aM operating class.
- Top-mounted fuse operation indicator.
- Live gripping lugs.
- Blade contact construction.
- 100 mm body width.
- High breaking capacity of 120 kA.
Reliable Short-Circuit Protection for High-Power Motors
The Mersen NH4AM69V800-8 is designed for the protection of high-power motors by rapidly interrupting severe fault currents while tolerating the temporary inrush currents generated during normal motor starting. Its advanced current-limiting characteristics help reduce thermal and mechanical stress on motors, conductors and switching equipment.
As an aM partial-range fuse, the NH4AM69V800-8 provides short-circuit protection only. It should always be coordinated with a suitable overload relay or motor protection circuit breaker to achieve complete motor protection.
Typical Applications
- High-power motor starter circuits.
- Motor control centres.
- Heavy industrial machinery.
- Mining and processing equipment.
- Large pumps, compressors and conveyors.
- Industrial switchgear and low-voltage distribution systems.
Technical Specifications
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| Fuse Indication | Visual indicator | |
|---|---|---|
| Current | 800 A | |
| Voltage | 690 V | |
| Device Type | Fuse link | |
| Fuse Type | NH (DIN) | |
| Fuse Class | aM | |
| Manufacturer | Mersen | |
| Series | NH Fuse-links aM 690 VAC | |
| Model | NH4AM69V800-8 | |
| Manufacturer item number | T227993 | |
| Product type | DIN NH motor fuse link | |
| Fuse size | NH4 | |
| Rated current | 800 A | |
| Rated voltage | 690 V AC | |
| Operating class | aM | |
| Breaking capacity | 120 kA | |
| Power dissipation | 65 W | |
| Body width | 100 mm | |
| Weight | Approx. 2 kg | |
| Indicator | Top indicator | |
| Gripping lugs | Live gripping lugs | |
| Compliance | IEC 60269, RoHS | |
| HS Code | 85361090 | |
| Country of Manufacture | Hungary |
Frequently Asked Questions
What is the Mersen NH4AM69V800-8 used for?
It provides short-circuit protection for large industrial motor circuits, motor starters, contactors and associated electrical equipment.
What is the current rating of this fuse?
The Mersen NH4AM69V800-8 has a rated current of 800 A.
What voltage is the NH4AM69V800-8 rated for?
The fuse is designed for operation at up to 690 V AC.
What does the aM operating class mean?
The aM operating class identifies a partial-range motor fuse designed specifically for short-circuit protection. It must be used together with a suitable overload protection device.
Can this fuse provide complete motor protection?
No. The NH4AM69V800-8 provides short-circuit protection only and should always be coordinated with an appropriate overload relay or motor protection circuit breaker.
Trusted for Industrial Motor Protection
Mersen NH aM fuse links are trusted by OEMs, panel builders and industrial maintenance professionals worldwide to deliver dependable short-circuit protection for high-power motor installations and critical industrial equipment.
