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.
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.
