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MERSEN FUSE NH 2 400A 690V AM B227977
Mersen NH2AM69V400 DIN NH Size 2 aM fuse link rated at 400 A and 690 V AC, featuring live gripping lugs and a double indicator for industrial motor short-circuit protection.
£18.49
Why Choose the Mersen NH2AM69V400 Motor Protection Fuse?
The Mersen NH2AM69V400 is a high-performance DIN NH aM fuse link designed specifically for short-circuit protection in industrial motor circuits. Its partial-range aM operating characteristic allows normal motor starting currents to pass without unnecessary fuse operation while providing rapid interruption of damaging short-circuit currents.
Part of the established Mersen NH aM 690 V fuse-link range, the NH2AM69V400 features a durable ceramic body, blade contacts, live gripping lugs and a double indicator. The indication system helps qualified maintenance personnel identify an operated fuse quickly, supporting efficient fault diagnosis and replacement.
With a rated current of 400 A, a rated voltage of 690 V AC and an NH Size 2 format, this fuse link is suitable for high-power motors, motor control centres and industrial machinery. As an aM fuse, it must be coordinated with a suitable overload relay or motor protection device to provide complete protection.
Key Advantages
- Purpose-designed aM fuse link for motor circuit protection.
- 400 A rated current for high-power industrial applications.
- 690 V AC voltage rating for demanding motor systems.
- Strong current-limiting performance during short-circuit faults.
- Double indicator enables rapid identification after operation.
- Standard NH Size 2 construction for compatible fuse equipment.
Key Features
- Mersen NH aM 690 V fuse-link series.
- 400 A rated current.
- 690 V AC rated voltage.
- NH Size 2 construction.
- Partial-range aM utilisation category.
- Designed for short-circuit protection of motor circuits.
- Live, non-isolated gripping lugs.
- Integrated double fuse-operation indicator.
- Low power-loss, current-limiting design.
- RoHS-compliant construction.
Reliable Short-Circuit Protection for High-Power Motors
The Mersen NH2AM69V400 is designed to tolerate the temporary inrush currents generated when industrial motors start. Its aM characteristic interrupts currents from approximately 6.3 times the fuse's rated current up to its maximum breaking capacity, providing effective short-circuit protection without responding unnecessarily during normal motor acceleration.
Because an aM fuse link does not provide overload protection, it should be used alongside a correctly selected overload relay, motor protection circuit breaker or equivalent protective device. This coordinated arrangement helps protect motors, contactors, cables and starter components against both overload and short-circuit conditions.
Typical Applications
- High-power industrial motor circuits.
- Motor control centres and control panels.
- Direct-on-line and star-delta motor starters.
- Pumps, compressors and ventilation equipment.
- Conveyors and materials-handling systems.
- OEM production and processing machinery.
Technical Specifications
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| Fuse Indication | Dual indicator | |
|---|---|---|
| Current | 400 A | |
| Voltage | 690 V | |
| Device Type | Fuse link | |
| Fuse Type | NH (DIN) | |
| Fuse Size | NH2 | |
| Fuse Class | aM | |
| Manufacturer | Mersen | |
| Series | NH aM 690 V Fuse Links | |
| Model | NH2AM69V400 | |
| Manufacturer reference | B227977 | |
| EAN / UPC | 8430399025322 | |
| Product type | DIN NH motor protection fuse link | |
| Utilisation category | aM | |
| NH size | NH2 | |
| Rated current | 400 A | |
| Rated voltage | 690 V AC | |
| Current type | AC | |
| Protection range | Partial-range short-circuit protection | |
| Indicator | Double indicator | |
| Gripping lugs | Live / non-isolated | |
| Body width | 52 mm | |
| Approximate weight | 0.64 kg | |
| Contact type | Blade contacts | |
| Typical mounting | Compatible NH2 fuse base | |
| RoHS compliant | Yes | |
| HS Code | 85361090 | |
| Country of Manufacture | Hungary |
Frequently Asked Questions
What is the Mersen NH2AM69V400 used for?
It is designed to provide short-circuit protection for high-power industrial motors, motor starters, contactors and associated motor control equipment.
What is the current rating of this fuse link?
The Mersen NH2AM69V400 has a rated current of 400 A.
What voltage is the NH2AM69V400 rated for?
This motor protection fuse link is rated for operation at up to 690 V AC.
What does the aM classification mean?
The aM classification identifies a partial-range fuse link designed to provide short-circuit protection for motor circuits while tolerating normal motor starting currents.
Does this fuse provide overload protection?
No. The NH2AM69V400 must be coordinated with a suitable overload relay or motor protection device to provide complete motor circuit protection.
Trusted by Industrial Electrical Professionals
Mersen NH aM fuse links are widely specified by panel builders, machine manufacturers, electrical contractors and maintenance engineers for dependable short-circuit protection in industrial motor control systems.
