Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
MERSEN FUSE NH4A 250KVA400V.NH4A2GTR250KVA NH4A2GTR250KVA
Mersen NH4A2GTR250KVA DIN NH4A2 gTr transformer protection fuse-link rated 361 A and 400 V AC for 250 kVA transformers with centre indicator and live gripping lugs.
£101.62
Why Choose the Mersen NH4A2GTR250KVA Transformer Protection Fuse-Link?
The Mersen NH4A2GTR250KVA is a heavy-duty DIN NH gTr low voltage transformer protection fuse-link designed to provide reliable overload and short-circuit protection for larger distribution transformers. Featuring a specialised gTr operating characteristic, it is engineered to accommodate transformer energisation currents while delivering fast and dependable fault interruption under abnormal operating conditions.
As part of the proven Mersen NH gTr 400 V AC fuse-link range, this NH4A2 size fuse-link is designed for protecting transformers with a nominal rating of 250 kVA. Its ceramic construction, centre-mounted blown-fuse indicator and live gripping lugs provide dependable performance and simplified maintenance within industrial and commercial electrical installations.
With a 361 A rated current, 400 V AC operating voltage and a 100 kA breaking capacity, the NH4A2GTR250KVA delivers exceptional protection for transformers, switchgear and low voltage power distribution systems where reliability is critical.
Key Advantages
- Purpose-designed gTr characteristic for transformer protection.
- Suitable for 250 kVA distribution transformers.
- 361 A rated current.
- 400 V AC operating voltage.
- 100 kA AC breaking capacity.
- Centre blown-fuse indicator for rapid status identification.
- Live gripping lugs improve handling during maintenance.
- Excellent current limitation reduces transformer and switchgear stress during faults.
Key Features
- Mersen NH gTr transformer protection fuse-link series.
- Catalogue number: NH4A2GTR250KVA.
- NH4A2 fuse size.
- 250 kVA transformer rating.
- 361 A rated current.
- 400 V AC rated voltage.
- Centre-mounted blown-fuse indicator.
- Live gripping lugs.
- Ceramic body with silver-plated blade contacts.
- Designed to IEC/DIN NH standards.
Reliable Protection for Distribution Transformers
The Mersen NH4A2GTR250KVA is engineered specifically for transformer protection applications where conventional general-purpose fuse-links cannot provide optimum coordination. Its gTr characteristic allows normal transformer magnetising currents while delivering dependable protection against overload and short-circuit conditions.
Its high breaking capacity and current-limiting performance help minimise thermal and mechanical stress on transformers, cables and switchgear, contributing to improved reliability and reduced maintenance costs in low voltage distribution systems.
Typical Applications
- 250 kVA distribution transformers.
- Industrial transformer feeder panels.
- Commercial electrical distribution systems.
- Low voltage substations.
- Industrial switchgear assemblies.
- OEM power distribution equipment.
- Manufacturing facilities.
- Infrastructure and utility installations.
Technical Specifications
Tick the specs you need, then view products that match.
| Fuse Indication | Visual indicator | |
|---|---|---|
| Current | 361 A | |
| Voltage | 400 V | |
| Device Type | Fuse link | |
| Fuse Type | NH (DIN) | |
| Fuse Size | NH4a | |
| Fuse Class | gTr | |
| Manufacturer | Mersen | |
| Series | NH gTr Transformer Protection Fuse-Links | |
| Model | NH4A2GTR250KVA | |
| Product type | DIN NH transformer protection fuse-link | |
| Fuse characteristic | gTr | |
| Fuse size | NH4A2 | |
| Transformer rating | 250 kVA | |
| Rated current | 361 A | |
| Rated voltage | 400 V AC | |
| Voltage type | AC | |
| Breaking capacity | 100 kA AC | |
| Indicator | Centre indicator | |
| Gripping lugs | Live gripping lugs | |
| Body width | 98 mm | |
| Power dissipation | 28 W | |
| Weight | Approx. 2.2 kg | |
| Compliance | IEC/DIN NH, RoHS compliant |
Frequently Asked Questions
What is the Mersen NH4A2GTR250KVA used for?
This fuse-link is specifically designed to protect low voltage distribution transformers against overloads and short-circuit faults.
What transformer rating is this fuse designed for?
The NH4A2GTR250KVA is intended for transformers with a nominal capacity of 250 kVA.
What is the rated current?
This transformer protection fuse has a rated current of 361 A.
What does the gTr characteristic provide?
The gTr characteristic is specifically developed for transformer protection, allowing normal energisation currents while providing dependable overload and fault protection.
What is the breaking capacity?
The NH4A2GTR250KVA provides a maximum AC breaking capacity of 100 kA.
Trusted by Electrical Professionals Worldwide
Mersen NH gTr transformer fuse-links are trusted by electrical engineers, transformer manufacturers and panel builders for dependable transformer protection, high fault interruption capability and long-term reliability in industrial power distribution systems.
