Why Choose the Mersen NH3GTR75KVA-8 Transformer Protection Fuse-Link?
The Mersen NH3GTR75KVA-8 is a high-performance DIN NH gTr fuse-link designed to protect low-voltage distribution transformers against overloads and short-circuit currents. Its transformer-specific operating characteristic is engineered to tolerate normal magnetising inrush currents while providing dependable disconnection during damaging electrical faults.
As part of Mersen's NH gTr 400 V AC fuse-link range, the NH3GTR75KVA-8 supports effective coordination with downstream circuit protection devices. Its current-limiting performance helps reduce thermal and electrodynamic stress on transformers, cables and associated switchgear, improving the reliability of industrial and commercial distribution systems.
Rated for a 75 kVA transformer, with a rated current of 108 A and a rated voltage of 400 V AC, this NH3 fuse-link features live gripping lugs, silver-plated copper blade contacts and a top-mounted operation indicator. It is designed for installation in compatible NH3 fuse bases and fuse-switch disconnectors by qualified electrical professionals.
Key Advantages
- Purpose-designed gTr characteristic for transformer protection.
- 75 kVA transformer rating for low-voltage distribution systems.
- 108 A rated current at 400 V AC.
- High 100 kA AC breaking capacity for dependable fault interruption.
- Transformer-specific operating curve tolerates normal energisation currents.
- Top-mounted indicator simplifies identification of an operated fuse-link.
- Current-limiting performance helps protect transformers and switchgear.
Key Features
- Mersen NH gTr 400 V AC fuse-link series.
- DIN NH3 fuse size.
- 75 kVA transformer capacity.
- 108 A rated current.
- 400 V AC rated operating voltage.
- gTr full-range transformer protection characteristic.
- 100 kA AC breaking capacity.
- Top-mounted fuse operation indicator.
- Live, non-insulated gripping lugs.
- Silver-plated copper blade terminals.
- Durable ceramic insulating body.
Distribution transformers can draw substantial magnetising inrush currents when energised. A gTr fuse-link is designed to withstand these temporary current peaks without unnecessary operation while still responding effectively to sustained overloads and severe short-circuit faults.
The Mersen NH3GTR75KVA-8 helps limit the peak fault current and energy passed into the protected circuit. When correctly selected and coordinated, it helps safeguard transformer windings, cables and switchgear while reducing the risk of wider disruption within the electrical distribution system.
Typical Applications
- Protection of 75 kVA low-voltage distribution transformers.
- Industrial transformer feeder circuits.
- Commercial building power distribution systems.
- Transformer switchboards and substations.
- Manufacturing facility electrical networks.
- NH3 fuse bases and fuse-switch disconnectors.
