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 H 1209P BCKUP 292-56/50 H1209PBCKUP292-56/50
Mersen N209312 Limitor-P high voltage DIN back-up fuse-link rated 12 kV AC and 50 A with a 63 kA breaking capacity and integrated 80 N striker for transformer protection.
£79.76
Why Choose the Mersen N209312 High Voltage Transformer Protection Fuse?
The Mersen N209312 is a high performance high voltage DIN back-up fuse-link developed to provide dependable short-circuit protection for transformers operating within medium voltage power distribution systems. Part of the proven Mersen Limitor®-P series, it delivers reliable current-limiting performance for substations, industrial switchgear and utility applications.
Designed for transformer protection in accordance with IEC 60282-1, the N209312 features pure silver fuse elements, silver-plated copper terminals and a robust ceramic body to ensure excellent electrical performance and long operational life. The integrated 80 N striker provides dependable fault indication and operation of compatible switchgear following fuse operation.
With a rated voltage of 12 kV AC, a rated current of 50 A and a 63 kA breaking capacity, the Mersen N209312 is ideally suited for protecting distribution transformers, ring main units and medium voltage switchgear where reliable fault interruption is essential.
Key Advantages
- Designed specifically for medium voltage transformer protection.
- 12 kV AC IEC rated voltage.
- 50 A rated current.
- Integrated 80 N striker for switchgear operation and fault indication.
- 63 kA breaking capacity for dependable fault interruption.
- Pure silver fuse elements provide consistent electrical performance.
- Silver-plated copper terminals ensure excellent conductivity.
- Manufactured in accordance with IEC 60282-1 and VDE T4 / VDE T402 requirements.
Key Features
- Mersen Limitor®-P high voltage DIN back-up fuse-link.
- Catalogue number: 45DB120V50P.
- Rated voltage: 12 kV AC.
- Rated current: 50 A.
- Fuse size: 56 mm diameter × 292 mm body length.
- Overall length: 358 mm.
- Integrated 80 N striker mechanism.
- Clip mounting with cylindrical terminals.
- Current-limiting back-up fuse for transformer protection.
Reliable Protection for Medium Voltage Transformers
High voltage back-up fuse-links rapidly interrupt severe short-circuit currents before excessive thermal or mechanical stress can damage transformer windings, switchgear and associated power distribution equipment. Their current-limiting performance improves system reliability while helping minimise equipment damage during electrical faults.
The Mersen N209312 combines dependable construction with proven electrical characteristics, making it suitable for utility, industrial and OEM transformer protection applications where reliable medium voltage protection is essential.
Typical Applications
- Medium voltage transformer protection.
- Electrical substations.
- Industrial switchgear.
- Ring main units.
- Utility power distribution systems.
- Renewable energy substations.
- OEM transformer equipment.
- Commercial and industrial electrical infrastructure.
Technical Specifications
Tick the specs you need, then view products that match.
| Device Type | Fuse link | |
|---|---|---|
| Fuse Type | High voltage | |
| Current | 50 A | |
| Voltage | 12000 V | |
| Manufacturer | Mersen | |
| Series | Limitor®-P | |
| Model | N209312 | |
| Catalogue number | 45DB120V50P | |
| Product type | High voltage DIN back-up fuse-link | |
| Application | Transformer protection | |
| Rated voltage | 12 kV AC IEC | |
| Rated current | 50 A | |
| Current type | AC | |
| Fuse dimensions | 56 mm diameter × 292 mm body length | |
| Overall length | 358 mm | |
| Mounting | Clip | |
| Breaking capacity | 63 kA | |
| Minimum breaking current | 160 A | |
| Clearing I²t | 40 kA²s | |
| Power dissipation | 70 W | |
| Cold resistance | 18 mΩ | |
| Striker force | 80 N | |
| Terminal material | Silver-plated copper | |
| Body material | Ceramic | |
| Weight | Approx. 1.7 kg | |
| Standards | IEC 60282-1, VDE T4, VDE T402 | |
| HS Code | 85351000 |
Frequently Asked Questions
What is the Mersen N209312 used for?
The Mersen N209312 is a high voltage DIN back-up fuse-link designed to protect transformers against damaging short-circuit currents within medium voltage electrical systems.
What are the voltage and current ratings?
The fuse has a rated voltage of 12 kV AC and a rated current of 50 A.
Does this fuse include a striker?
Yes. It incorporates an integrated 80 N striker for fault indication and operation of compatible switchgear.
What is the breaking capacity?
The N209312 provides a maximum AC breaking capacity of 63 kA.
Where is this fuse commonly installed?
It is commonly installed within transformer substations, industrial switchgear, ring main units and medium voltage power distribution systems.
Trusted by Power Distribution Professionals Worldwide
Mersen Limitor® high voltage fuse-links are trusted worldwide by utilities, OEMs, switchgear manufacturers and industrial engineers for dependable transformer and medium voltage equipment protection.
