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MERSEN FUSE NH4A 630KVA 400V GTR TI NH42GTR630KVA-8
Mersen NH42GTR630KVA-8 NH4a gTr transformer fuse-link rated at 909 A and 400 V AC for protecting 630 kVA distribution transformers.
£119.11
Why Choose the Mersen NH42GTR630KVA-8 Transformer Fuse-Link?
The Mersen NH42GTR630KVA-8 is a high-performance NH gTr low voltage transformer fuse-link specifically designed to protect distribution transformers against short circuits while safely accommodating transformer magnetising inrush currents. Built to DIN NH standards, it delivers reliable transformer protection for industrial, commercial and utility power distribution systems.
As part of the proven Mersen NH gTr 400 V AC fuse-link series, the NH42GTR630KVA-8 combines excellent current-limiting characteristics with a high breaking capacity, helping minimise damage during electrical faults. Its top-mounted operating indicator enables quick visual identification of a blown fuse, while the live gripping tags allow safe replacement using an approved NH fuse puller.
Designed for protecting 630 kVA transformers, this NH4a fuse-link features a 909 A rated current and a 400 V AC operating voltage. It is ideally suited for transformer substations, industrial switchgear, manufacturing facilities and commercial power distribution systems requiring dependable transformer protection.
Key Advantages
- Specially engineered gTr characteristic for transformer protection.
- Designed for 630 kVA distribution transformers.
- 909 A rated current.
- 400 V AC operating voltage.
- High 100 kA breaking capacity for dependable fault interruption.
- Top-mounted indicator provides rapid fuse status identification.
- Live gripping tags support safer fuse replacement.
- Excellent current-limiting performance reduces transformer stress during faults.
Key Features
- Mersen NH gTr transformer fuse-link series.
- NH4a fuse size.
- 909 A rated current.
- 400 V AC rated voltage.
- Transformer-specific gTr operating characteristic.
- Top-mounted operating indicator.
- Live gripping tags.
- 98 mm body width.
- Silver-plated copper blade contacts.
- Robust ceramic insulating body.
Reliable Protection for Distribution Transformers
The Mersen NH42GTR630KVA-8 is specifically designed for transformer protection. Its gTr time-current characteristic is carefully matched to transformer operating behaviour, allowing it to withstand normal energisation currents while rapidly clearing damaging short-circuit faults. This helps maximise transformer life and improve system reliability.
The fuse-link also provides excellent selectivity when coordinated with downstream protective devices, helping to minimise unnecessary power interruptions. Its DIN NH construction ensures compatibility with standard NH4a fuse bases used throughout industrial and commercial electrical installations.
Typical Applications
- 630 kVA distribution transformer protection.
- Industrial transformer substations.
- Commercial power distribution systems.
- Low voltage switchgear assemblies.
- Manufacturing facilities.
- Infrastructure and utility installations.
- Electrical distribution panels.
Technical Specifications
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| Current | 909 A | |
|---|---|---|
| Voltage | 400 V | |
| Device Type | Fuse link | |
| Fuse Type | NH (DIN) | |
| Fuse Size | NH4a | |
| Fuse Class | gTr | |
| Manufacturer | Mersen | |
| Series | NH Fuse-links gTr 400 V AC | |
| Model | NH42GTR630KVA-8 | |
| Item number | W1030488 | |
| Product type | NH transformer fuse-link | |
| Fuse characteristic | gTr | |
| Transformer rating | 630 kVA | |
| Rated current | 909 A | |
| Rated voltage | 400 V AC | |
| Breaking capacity | 100 kA AC | |
| Fuse size | NH4a | |
| Indicator type | Top indicator | |
| Gripping tags | Live tags | |
| Mounting type | Clip mounting | |
| Terminal material | Silver-plated copper | |
| Terminal type | Plain blades | |
| Body width | 98 mm | |
| Dimensions (L × W × H) | Approx. 200 × 98 × 122 mm | |
| Power dissipation | 66 W | |
| Weight | Approx. 2.2 kg | |
| RoHS compliant | Yes | |
| HS Code | 85361090 | |
| Country of Manufacture | Hungary |
Frequently Asked Questions
What is the Mersen NH42GTR630KVA-8 used for?
This NH gTr fuse-link is designed to protect 630 kVA distribution transformers against overloads and short circuits while tolerating transformer energisation currents.
What transformer rating is this fuse designed for?
The NH42GTR630KVA-8 is designed for transformers with a nominal rating of 630 kVA.
What is the rated current of this fuse-link?
The fuse-link has a rated current of 909 A.
What does the gTr characteristic mean?
The gTr characteristic is specifically developed for transformer protection, allowing transformer inrush currents while providing dependable overload and short-circuit protection.
What type of indication system does this fuse include?
The NH42GTR630KVA-8 incorporates a top-mounted indicator that provides a clear visual indication when the fuse-link has operated.
Trusted for Transformer Protection
Mersen NH gTr transformer fuse-links are trusted worldwide by electrical engineers, utilities and panel builders for delivering dependable transformer protection, excellent selectivity and high-performance fault interruption.
