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MERSEN FUSE H 729P BCKUP 192-56/50 E729PIB-D2192/50
Mersen A209300 Limitor-PD DIN high-voltage transformer back-up fuse rated at 7.2 kV AC and 50 A with a 63 kA breaking capacity and integrated 80 N striker.
£93.31
Why Choose the Mersen A209300 High-Voltage Transformer Fuse?
The Mersen A209300, catalogue number 45DB72V50PD, is a premium DIN high-voltage back-up fuse engineered for dependable transformer protection in medium-voltage electrical systems. As part of the proven Mersen Limitor®-PD series, it is designed to safely interrupt high short-circuit currents while protecting transformers, switchgear and associated power distribution equipment.
Manufactured using pure silver fuse elements, silver-plated copper terminals and a robust ceramic body, the A209300 delivers reliable electrical performance and long operational life. Its integrated 80 N striker provides positive mechanical indication when the fuse operates and can actuate compatible switchgear tripping mechanisms.
With a rated voltage of 7.2 kV AC, a rated current of 50 A and a 63 kA breaking capacity, the A209300 is ideally suited for protecting medium-voltage transformers in industrial installations, substations and utility distribution systems.
Key Advantages
- Designed specifically for medium-voltage transformer protection.
- 7.2 kV AC IEC rated voltage.
- 50 A rated current.
- 63 kA maximum breaking capacity.
- Integrated 80 N striker for indication and switchgear actuation.
- Current-limiting design reduces thermal and mechanical fault stresses.
- Manufactured using ceramic, pure silver and silver-plated copper components.
Key Features
- Mersen Limitor®-PD transformer back-up fuse.
- Manufacturer part number: A209300.
- Catalogue number: 45DB72V50PD.
- Rated voltage: 7.2 kV AC.
- Rated current: 50 A.
- Maximum breaking capacity: 63 kA.
- Minimum interrupting current: 194 A.
- Fuse dimensions: 56 × 192 mm.
- 80 N striker indication system.
- Clip-mounted cylindrical terminals.
Reliable Protection for Medium-Voltage Transformers
The Mersen A209300 is engineered to interrupt high short-circuit currents before they can damage transformers or associated switchgear. Its current-limiting characteristics minimise peak fault current and fault energy, helping extend equipment life while reducing maintenance requirements.
The integrated striker provides mechanical indication following fuse operation and can actuate compatible switchgear mechanisms for rapid fault isolation and improved system safety.
Typical Applications
- Medium-voltage distribution transformers.
- Industrial switchgear.
- Electrical substations.
- Utility distribution networks.
- Industrial power distribution systems.
- Transformer protection panels.
- Medium-voltage electrical installations.
Technical Specifications
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| Device Type | Fuse link | |
|---|---|---|
| Fuse Type | High voltage | |
| Current | 50 A | |
| Voltage | 7200 V | |
| Manufacturer | Mersen | |
| Series | Limitor®-PD | |
| Manufacturer part number | A209300 | |
| Catalogue number | 45DB72V50PD | |
| Product type | DIN high-voltage transformer back-up fuse | |
| Rated voltage | 7.2 kV AC IEC | |
| Rated current | 50 A | |
| Maximum breaking capacity | 63 kA | |
| Minimum interrupting current | 194 A | |
| Clearing I²t | 25.3 kA²s | |
| Cold resistance | 9.3 mΩ (±10%) | |
| Power dissipation | 35 W | |
| Fuse diameter | 56 mm | |
| Fuse length | 192 mm | |
| Mounting type | Clip mounting | |
| Terminal type | Cylindrical | |
| Terminal material | Silver-plated copper | |
| Fuse element material | Pure silver | |
| Body material | Ceramic | |
| Striker force | 80 N | |
| Current type | AC | |
| Approximate weight | 1.2 kg | |
| EAN | 3605340217995 | |
| Compliance | IEC 60282-1, VDE 0670 T402, RoHS compliant | |
| HS Code | 85351000 | |
| Country of Manufacture | Hungary |
Frequently Asked Questions
What is the Mersen A209300 used for?
The A209300 is a DIN high-voltage back-up fuse designed to protect medium-voltage transformers against damaging short-circuit currents.
What is the voltage rating?
The fuse has a rated operating voltage of 7.2 kV AC.
What is the current rating?
The Mersen A209300 has a rated current of 50 A.
What is the breaking capacity?
The fuse provides a maximum AC breaking capacity of 63 kA with a minimum interrupting current of 194 A.
What does the integrated striker do?
The integrated 80 N striker provides mechanical indication when the fuse operates and can actuate compatible switchgear tripping or signalling mechanisms.
What standards does this fuse comply with?
The A209300 complies with IEC 60282-1 and VDE 0670 T402 requirements for high-voltage transformer back-up fuses.
Trusted High-Voltage Protection from Mersen
Mersen Limitor®-PD high-voltage fuse-links are trusted by utilities, transformer manufacturers, switchgear builders and industrial engineers to provide dependable transformer protection in demanding medium-voltage applications.
