Why Choose the Mersen NH4A2GTR1000KVA Transformer Fuse-Link?
The Mersen NH4A2GTR1000KVA is a heavy-duty NH4a gTr fuse-link developed specifically for the protection of low-voltage distribution transformers. Its transformer-matched time-current characteristic provides dependable protection against overloads and short-circuit faults while accommodating the temporary magnetising inrush current produced when a transformer is energised.
Designed for transformer applications rated at approximately 1000 kVA, this fuse-link has a rated current of 1443 A and an operating voltage of 400 V AC. The gTr characteristic supports effective selectivity with downstream gG fuse-links, helping isolate faults at the correct point while reducing unnecessary interruption to the wider electrical installation.
The NH4A2GTR1000KVA combines a durable ceramic body with silver-plated copper blade contacts, live gripping lugs and a centre-mounted visual indicator. Its 100 kA AC breaking capacity provides reliable interruption of high prospective fault currents in industrial switchboards, transformer substations and commercial power distribution systems.
Key Advantages
- Purpose-designed gTr fuse-link for transformer protection.
- Suitable for transformer applications rated at approximately 1000 kVA.
- 1443 A rated current for high-capacity electrical distribution systems.
- 400 V AC voltage rating for low-voltage transformer installations.
- High 100 kA AC breaking capacity for reliable fault interruption.
- Transformer-adapted characteristic helps tolerate normal energisation currents.
- Supports coordinated selectivity with downstream gG fuse-links.
- Centre indicator allows straightforward visual identification of fuse operation.
Key Features
- Mersen NH gTr transformer fuse-link series.
- NH4a fuse size manufactured to the DIN NH format.
- 1000 kVA nominal transformer application rating.
- 1443 A rated current.
- 400 V AC rated operational voltage.
- gTr full-range transformer protection characteristic.
- 100 kA maximum AC breaking capacity.
- Integrated centre-mounted fuse indicator.
- Live gripping lugs for handling with a suitable LV HRC fuse puller.
- Silver-plated copper plain-blade terminals.
- Robust ceramic insulating body.
- Clip mounting for compatible NH fuse bases.
Transformers can draw a substantial magnetising current for a short period when first energised. A conventional fuse selected only according to normal operating current may operate unnecessarily during this inrush period. The gTr characteristic of the Mersen NH4A2GTR1000KVA is specifically adapted to transformer behaviour, helping it withstand permissible temporary current peaks while still responding accurately to sustained overloads.
The fuse-link also provides high current limitation and effective coordination with downstream protection. When a significant fault occurs, its high breaking capacity allows it to safely interrupt the circuit, helping protect transformers, cables, switchgear and other valuable distribution equipment.
Typical Applications
- Protection of low-voltage transformers rated around 1000 kVA.
- Industrial transformer substations.
- Main electrical distribution switchboards.
- Manufacturing and processing facilities.
- Commercial building power distribution systems.
- Infrastructure and utility installations.
- Transformer secondary-side protection assemblies.
- High-capacity NH fuse-base installations.
