Why Choose the Mersen A1000247 High-Voltage Transformer Fuse?
The Mersen A1000247, catalogue number 45DB120V63PD, is a high-performance DIN high-voltage back-up fuse developed to protect transformers against damaging short-circuit currents. Part of the Mersen Limitor®-PD series, it is designed for reliable use in medium-voltage switchgear, controlgear and electrical distribution systems.
Rated at 12 kV AC and 63 A, the A1000247 delivers strong current-limiting performance during severe electrical faults. By restricting the peak current and total energy passed into the protected circuit, it helps reduce thermal and mechanical stress on transformer windings, cables and associated switchgear.
The fuse uses pure silver fuse elements, silver-plated copper terminals and a robust ceramic body for dependable electrical performance. Its nominal 65 × 292 mm DIN format is designed for clip mounting, while an integrated 80 N striker provides fuse-operation indication and can actuate compatible switchgear mechanisms.
Key Advantages
- Designed specifically for high-voltage transformer protection.
- 12 kV AC rated voltage for medium-voltage systems.
- 63 A rated current.
- High 80 kA breaking capacity.
- Strong current limitation reduces damaging short-circuit energy.
- Integrated 80 N striker for operation indication and tripping.
- Robust ceramic body for dependable industrial performance.
- Complies with recognised IEC, VDE and DIN requirements.
Key Features
- Mersen Limitor®-PD transformer back-up fuse.
- Manufacturer part number: A1000247.
- Catalogue number: 45DB120V63PD.
- Rated voltage: 12 kV AC.
- Rated current: 63 A.
- Maximum breaking capacity: 80 kA.
- Minimum interrupting current: 220 A.
- Nominal fuse size: 65 × 292 mm.
- Indication system: 80 N striker.
- Clip mounting with cylindrical terminals.
The Mersen A1000247 is designed to interrupt high short-circuit currents before they can cause extensive damage to transformers or associated electrical equipment. Its current-limiting operation restricts the peak fault current and clearing energy, helping protect transformer windings, conductors and switchgear components.
As a back-up fuse, the A1000247 is intended primarily for high-value fault currents. It must be correctly coordinated with suitable switching or protective equipment to provide complete circuit protection across the required current range.
Typical Applications
- Medium-voltage distribution transformer protection.
- High-voltage switchgear and controlgear.
- Transformer substations.
- Industrial electrical distribution systems.
- Utility and infrastructure installations.
- Indoor medium-voltage electrical equipment.
- Fuse-switch combinations for transformer circuits.
