Why Choose the Mersen NH4A2GTR630KVA NH Fuse-Link?
The Mersen NH4A2GTR630KVA is a heavy-duty DIN NH gTr fuse-link designed specifically for the protection of 630 kVA distribution transformers. Its transformer-optimised time-current characteristic accommodates normal transformer magnetising inrush while providing dependable full-range protection against overload and short-circuit conditions.
Part of the Mersen NH transformer protection range, this fuse-link has an NH4a body size, a rated current of 909 A and a rated operating voltage of 400 V AC. It also offers a high 100 kA AC breaking capacity, making it suitable for demanding low voltage power distribution systems with substantial prospective fault currents.
The NH4A2GTR630KVA incorporates a centre indicator for convenient identification of an operated fuse-link and live metal gripping lugs for handling with an approved NH fuse replacement device. Its robust design makes it suitable for transformer feeders, industrial switchboards, infrastructure projects and other installations requiring reliable high-capacity transformer protection.
Key Advantages
- Purpose-designed for protecting 630 kVA transformers.
- gTr full-range transformer protection characteristic.
- Rated at 909 A and 400 V AC.
- High 100 kA breaking capacity for demanding distribution systems.
- Centre indicator simplifies identification of an operated fuse-link.
- Transformer-specific characteristic accommodates normal magnetising inrush.
- Supports effective selectivity with downstream gG fuse protection.
Key Features
- Mersen NH gTr transformer protection fuse-link.
- 630 kVA transformer capacity rating.
- 909 A rated current.
- 400 V AC rated voltage.
- NH4a fuse-link size.
- 100 kA AC breaking capacity.
- Integrated centre operation indicator.
- Live metal gripping lugs for use with an approved NH fuse puller.
- Standard blade-contact format for compatible NH fuse bases and switchgear.
Transformer protection fuse-links must tolerate the temporary current surge produced when a transformer is energised without compromising protection during genuine overload or fault conditions. The Mersen gTr characteristic is specifically coordinated with transformer operating behaviour, helping reduce unnecessary fuse operation while maintaining reliable protection.
The NH4A2GTR630KVA also supports effective selectivity with downstream gG fuse-links, helping isolate faults closer to their source and reducing disruption to the wider distribution system. Installation, replacement and maintenance must be completed by suitably qualified electrical personnel using approved equipment.
Typical Applications
- Protection of 630 kVA distribution transformers.
- Industrial transformer feeder circuits.
- Main low voltage switchboards.
- Power distribution panels and substations.
- Commercial and infrastructure electrical systems.
- Manufacturing plants and process facilities.
