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MERSEN FUSE NH 3 300A 690V AM NH3AM69V300
Mersen NH3AM69V300 NH3 aM fuse-link rated at 300 A and 690 V AC, designed for short-circuit protection of high-power industrial motor circuits.
£45.60
Why Choose the Mersen NH3AM69V300 NH Fuse-Link?
The Mersen NH3AM69V300 is a robust NH size 3 aM fuse-link designed to provide dependable short-circuit protection for high-power industrial motors and associated electrical equipment. Rated at 300 A and 690 V AC, it is suitable for demanding motor control centres, industrial switchboards and low-voltage power distribution systems.
As an aM partial-range fuse-link, the NH3AM69V300 is specifically engineered for motor circuit protection. Its strong current-limiting performance helps reduce the thermal and mechanical stresses caused by short-circuit currents, protecting cables, contactors and other downstream components. Separate overload protection must be installed to provide complete motor protection.
The fuse-link features a durable ceramic body, standard NH blade contacts, live gripping lugs and a double indication system for convenient fuse status identification. Its DIN-standard NH3 construction allows installation in compatible fuse bases and switch-fuse equipment used throughout industrial electrical installations.
Key Advantages
- Reliable short-circuit protection for high-power industrial motors.
- 300 A current rating for demanding motor control applications.
- 690 V AC rated voltage for industrial power networks.
- Strong current-limiting performance helps minimise equipment damage.
- Low power losses support efficient electrical system operation.
- Double indication provides clear identification of fuse operation.
- Live gripping lugs support handling with an approved NH fuse puller.
Key Features
- Mersen NH aM motor-circuit fuse-link series.
- NH3 fuse size.
- 300 A rated current.
- 690 V AC rated voltage.
- aM partial-range operating characteristic.
- Double visual indication system.
- Live, non-isolated gripping lugs.
- DIN-standard blade contact design.
- Durable ceramic insulating body.
- Dimensions manufactured in accordance with DIN NH requirements.
Reliable Protection for High-Power Motor Circuits
The Mersen NH3AM69V300 is designed to interrupt damaging short-circuit currents before they can cause serious thermal or mechanical damage to motors, cables, contactors and switchgear. Its current-limiting characteristics reduce the energy passed through to downstream equipment during an electrical fault.
As an aM fuse-link, the NH3AM69V300 is intended for short-circuit protection only. It must be used with a correctly selected overload relay, motor protection circuit breaker or equivalent protective device. Installation and replacement should only be undertaken by qualified electrical personnel using compatible NH equipment.
Typical Applications
- High-power industrial motor circuits.
- Motor control centres and industrial switchboards.
- Pumps, fans, compressors and conveyor systems.
- Manufacturing and process automation equipment.
- Machine-building and OEM control panels.
- Industrial switch-fuse and power distribution assemblies.
Technical Specifications
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| Fuse Indication | Dual indicator | |
|---|---|---|
| Current | 300 A | |
| Voltage | 690 V | |
| Device Type | Fuse link | |
| Fuse Type | NH (DIN) | |
| Fuse Size | NH3 | |
| Fuse Class | aM | |
| Manufacturer | Mersen | |
| Series | NH aM Fuse-Links | |
| Model | NH3AM69V300 | |
| Manufacturer item number | E227980 | |
| Product type | NH motor-circuit fuse-link | |
| Fuse size | NH3 | |
| Utilisation category | aM | |
| Rated current | 300 A | |
| Rated voltage | 690 V AC | |
| Current type | AC | |
| Indication system | Double indicator | |
| Gripping lug type | Live / non-isolated | |
| Contact type | NH blade contacts | |
| Body material | Ceramic | |
| Body width | 71.9 mm | |
| Product weight | approx. 1.05 kg | |
| EAN | 8430399025353 | |
| Standards | IEC 60269-1 and IEC 60269-2 | |
| Compliance | RoHS compliant | |
| HS Code | 85361090 | |
| Country of Manufacture | Hungary |
Frequently Asked Questions
What is the Mersen NH3AM69V300 used for?
The Mersen NH3AM69V300 provides short-circuit protection for high-power industrial motors, motor starters and associated electrical equipment.
What are the current and voltage ratings?
The NH3AM69V300 has a rated current of 300 A and a rated operating voltage of 690 V AC.
Does this fuse-link provide overload protection?
No. Its aM characteristic provides partial-range short-circuit protection, so it must be coordinated with a separate overload protection device.
What fuse size is the NH3AM69V300?
This product is an NH3 size fuse-link designed for installation in compatible NH3 fuse bases and switch-fuse assemblies.
Who should install or replace this fuse-link?
The fuse-link should only be installed or replaced by a qualified electrical professional using a suitable NH fuse replacement device.
Trusted Industrial Circuit Protection
Mersen NH fuse-links are widely specified by electrical engineers, panel builders and industrial equipment manufacturers for dependable motor circuit protection in demanding electrical systems.
