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MERSEN FUSE NH 4A 800A 500V AM NH4AAM50V800-8
Mersen NH4AAM50V800-8 DIN NH4a aM motor fuse link rated at 800 A and 500 V AC with top indicator, live gripping lugs and 120 kA breaking capacity for industrial motor short-circuit protection.
£104.98
Why Choose the Mersen NH4AAM50V800-8 Motor Fuse Link?
The Mersen NH4AAM50V800-8 is a heavy-duty DIN NH aM fuse link specifically designed to provide dependable short-circuit protection for high-power industrial motor circuits. Manufactured by Mersen, this NH Size 4a fuse link delivers outstanding current-limiting performance, protecting large motors, contactors, motor starters and associated electrical equipment from damaging fault currents while ensuring reliable operation in demanding industrial environments.
Featuring a rated current of 800 A and a 500 V AC operating voltage, the NH4AAM50V800-8 is designed to withstand the high inrush currents associated with motor starting while rapidly interrupting severe short-circuit faults. Its aM operating class makes it ideal for motor protection systems used alongside a suitable overload relay or motor protection circuit breaker.
Manufactured in the standard NH Size 4a format, this fuse link features blade contacts, live gripping lugs and a top-mounted operation indicator. Its durable ceramic construction, high breaking capacity and compliance with IEC standards make it suitable for motor control centres, industrial switchgear and low-voltage power distribution systems.
Key Advantages
- Purpose-designed aM fuse link for industrial motor short-circuit protection.
- 800 A rated current for high-power motor applications.
- 500 V AC rated voltage.
- High current-limiting performance reduces thermal and mechanical fault stress.
- Designed to withstand normal motor starting currents.
- Top-mounted indicator enables rapid visual identification of fuse operation.
- Live gripping lugs support safe replacement using approved NH fuse pullers.
Key Features
- Mersen NH fuse-links aM 500 VAC series.
- NH Size 4a.
- 800 A rated current.
- 500 V AC rated voltage.
- Partial-range aM operating class.
- 120 kA AC breaking capacity.
- Top-mounted fuse operation indicator.
- Live gripping lugs.
- Blade contact construction.
- 100 mm body width.
Reliable Short-Circuit Protection for High-Power Motors
The Mersen NH4AAM50V800-8 is engineered to interrupt high fault currents while allowing the temporary inrush currents generated during normal motor starting. Its advanced current-limiting characteristics help reduce damage to motors, conductors and switching equipment, improving system reliability and reducing maintenance costs.
As an aM partial-range fuse, the NH4AAM50V800-8 provides short-circuit protection only. It should always be coordinated with a suitable overload relay or motor protection circuit breaker to provide complete motor circuit protection.
Typical Applications
- High-power motor starter circuits.
- Motor control centres.
- Mining and processing equipment.
- Large pumps, compressors and conveyor systems.
- Heavy industrial manufacturing machinery.
- Industrial switchgear and low-voltage distribution systems.
Technical Specifications
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| Current | 800 A | |
|---|---|---|
| Fuse Indication | Visual indicator | |
| Voltage | 500 V | |
| Device Type | Fuse link | |
| Fuse Type | NH (DIN) | |
| Fuse Size | NH4a | |
| Fuse Class | aM | |
| Manufacturer | Mersen | |
| Series | NH Fuse-links aM 500 VAC | |
| Model | NH4AAM50V800-8 | |
| Manufacturer item number | T233559 | |
| EAN | 8430399027906 | |
| Product type | DIN NH motor fuse link | |
| Fuse size | NH4a | |
| Rated current | 800 A | |
| Rated voltage | 500 V AC | |
| Operating class | aM | |
| Current type | AC | |
| Breaking capacity | 120 kA AC | |
| Power dissipation | 65 W | |
| Body width | 100 mm | |
| Weight | Approx. 2.2 kg | |
| Indicator | Top indicator | |
| Gripping lugs | Live gripping lugs | |
| Contact type | Blade contacts | |
| Compliance | IEC 60269, RoHS compliant | |
| HS Code | 85361090 | |
| Country of Manufacture | Hungary |
Frequently Asked Questions
What is the Mersen NH4AAM50V800-8 used for?
It provides short-circuit protection for high-power industrial motor circuits, motor starters, contactors and associated electrical equipment.
What is the current rating of this fuse?
The Mersen NH4AAM50V800-8 has a rated current of 800 A.
What voltage is the NH4AAM50V800-8 rated for?
The fuse is designed for operation at up to 500 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 an appropriate overload protection device.
Can this fuse provide complete motor protection?
No. The NH4AAM50V800-8 provides short-circuit protection only and should always be coordinated with a suitable overload relay or motor protection circuit breaker.
Trusted for Industrial Motor Protection
Mersen NH aM fuse links are trusted worldwide by OEMs, panel builders and industrial maintenance professionals to deliver dependable short-circuit protection for high-power motors and critical industrial machinery.
