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MERSEN FUSE NH4AC 400KVA 400V GTR TI NH4AGTR400KVA-8
Mersen NH4AGTR400KVA-8 DIN NH4a gTr transformer protection fuse-link rated at 577 A and 400 V AC for 400 kVA transformers with top-mounted indicator and high current limiting performance.
£183.79
Why Choose the Mersen NH4AGTR400KVA-8 Transformer Protection Fuse-Link?
The Mersen NH4AGTR400KVA-8 is a heavy-duty DIN NH gTr fuse-link engineered specifically for the protection of low-voltage distribution transformers. Its dedicated gTr operating characteristic is designed to withstand normal transformer energisation currents whilst providing rapid disconnection during overload and short-circuit conditions.
As part of Mersen's NH gTr 400 V AC fuse-link range, the NH4AGTR400KVA-8 provides outstanding current-limiting performance and high fault interruption capability. The characteristic is optimised for transformer protection, helping minimise thermal and mechanical stress on transformer windings, cables and associated switchgear while improving system reliability.
Designed for 400 kVA transformers, this NH4a fuse-link has a 577 A rated current, 400 V AC rated voltage, live gripping lugs and a top-mounted operation indicator. Its robust ceramic construction makes it ideal for demanding industrial, commercial and utility distribution installations.
Key Advantages
- Purpose-designed gTr transformer protection fuse-link.
- 400 kVA transformer rating.
- 577 A rated current.
- 400 V AC rated operating voltage.
- High current-limiting performance protects transformers and switchgear.
- Top-mounted indicator enables rapid identification of an operated fuse-link.
- Designed to withstand normal transformer inrush currents.
Key Features
- Mersen NH gTr 400 V AC fuse-link series.
- DIN NH4a fuse size.
- 400 kVA transformer capacity.
- 577 A rated current.
- 400 V AC rated voltage.
- gTr transformer protection characteristic.
- 100 kA AC breaking capacity.
- Top-mounted operation indicator.
- Live gripping lugs.
- Silver-plated copper blade contacts.
- Body width: 72.9 mm.
Reliable Protection for Distribution Transformers
Distribution transformers generate high magnetising inrush currents during energisation. The gTr operating characteristic is specifically developed to tolerate these temporary current peaks whilst still providing reliable protection against overloads and severe short-circuit faults.
The NH4AGTR400KVA-8 provides excellent selectivity with downstream gG fuse-links and limits the energy transmitted during fault conditions, helping extend transformer service life while improving the reliability of low-voltage power distribution systems.
Typical Applications
- Protection of 400 kVA low-voltage transformers.
- Industrial transformer feeder circuits.
- Commercial power distribution systems.
- Substations and transformer switchboards.
- Manufacturing and process plants.
- NH4a fuse bases and fuse-switch disconnectors.
Technical Specifications
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| Fuse Indication | Visual indicator | |
|---|---|---|
| Voltage | 400 V | |
| Device Type | Fuse link | |
| Fuse Type | NH (DIN) | |
| Fuse Size | NH4a | |
| Fuse Class | gTr | |
| Current | 577 A | |
| Manufacturer | Mersen | |
| Series | NH gTr 400 V AC Fuse-Links | |
| Model | NH4AGTR400KVA-8 | |
| Manufacturer part number | L1028731 | |
| Product type | DIN NH transformer protection fuse-link | |
| Utilisation category | gTr | |
| Fuse size | NH4a | |
| Transformer rating | 400 kVA | |
| Rated current | 577 A | |
| Rated voltage | 400 V AC | |
| Breaking capacity | 100 kA AC | |
| Mounting type | Clip mounting | |
| Indicator | Top-mounted indicator | |
| Gripping lugs | Live gripping lugs | |
| Terminal type | Plain NH blades | |
| Body width | 72.9 mm | |
| Power dissipation | 39 W | |
| Weight | 2.2 kg | |
| EAN | 3605340534993 | |
| Compliance | IEC 60269, RoHS, CE and UKCA | |
| HS Code | 85361090 | |
| Country of Manufacture | Hungary |
Frequently Asked Questions
What is the Mersen NH4AGTR400KVA-8 used for?
It is designed to protect 400 kVA low-voltage distribution transformers against overloads and short-circuit faults.
What is the rated current of this fuse-link?
The NH4AGTR400KVA-8 has a rated current of 577 A.
What does the gTr characteristic mean?
The gTr operating characteristic is specifically designed for transformer protection, allowing normal transformer energisation currents while providing dependable fault protection.
What fuse size is the NH4AGTR400KVA-8?
This product is a DIN NH4a fuse-link for installation in compatible NH4a fuse bases and fuse-switch disconnectors.
Does this fuse include an operation indicator?
Yes. The NH4AGTR400KVA-8 incorporates a top-mounted indicator to simplify maintenance and fuse replacement.
Trusted Transformer Protection from Mersen
Mersen NH gTr fuse-links are trusted worldwide by transformer manufacturers, panel builders and electrical engineers for reliable transformer protection, excellent current limitation and dependable long-term performance.
