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.
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.
