Why Choose the Mersen NH3GTR250KVA Transformer Protection Fuse-Link?
The Mersen NH3GTR250KVA is a specialist DIN NH gTr low-voltage fuse-link designed specifically for the protection of distribution transformers. Rated for a 250 kVA transformer, with a 361 A rated current and 400 V AC operating voltage, this NH Size 3 fuse-link provides dependable protection while accommodating normal transformer energisation currents.
Part of Mersen's dedicated NH gTr transformer protection range, the NH3GTR250KVA features live gripping lugs and a centre indicator. The centre indicator provides clear visual confirmation after the fuse-link has operated, while the gripping lugs allow handling with an approved low-voltage HRC fuse replacement device.
The fuse-link's gTr time-current characteristic is specifically adapted to transformer operating conditions. It provides improved selectivity with downstream gG fuse-links and helps protect the transformer, cables and associated switchgear against damaging overload and short-circuit currents.
Key Advantages
- Purpose-designed for distribution transformer protection.
- Matched to transformers with a rating of 250 kVA.
- 361 A rated current for high-capacity transformer circuits.
- 400 V AC voltage rating for low-voltage distribution systems.
- gTr characteristic accommodates normal transformer energisation currents.
- Improved selectivity with downstream gG fuse protection.
- Centre indicator allows rapid identification after fuse operation.
Key Features
- Mersen NH gTr 400 V AC fuse-link range.
- Catalogue reference: NH3GTR250KVA.
- Manufacturer item number: P1030505A.
- 250 kVA transformer rating.
- 361 A rated current.
- 400 V AC rated voltage.
- NH Size 3 construction.
- gTr transformer protection characteristic.
- Centre indication system.
- Live, non-isolated gripping lugs.
The Mersen NH3GTR250KVA is engineered to match the operating characteristics of a distribution transformer. Its gTr response tolerates temporary magnetising inrush currents during transformer energisation while providing reliable interruption when sustained overload or short-circuit conditions occur.
This specialised characteristic can improve coordination between the transformer fuse-link and downstream protective devices. Its current-limiting action also helps reduce the thermal and electrodynamic stresses placed on the transformer, cables and switchgear during severe electrical faults.
Typical Applications
- 250 kVA distribution transformer protection.
- Industrial substations and transformer panels.
- Commercial power distribution systems.
- Transformer switchgear and fuse bases.
- Manufacturing and processing facilities.
- Low-voltage electrical infrastructure.
