Why Choose the Mersen W1000266 Limitor®-PTD High Voltage Back-up Fuse?
The Mersen W1000266 is a premium Limitor®-PTD high voltage DIN back-up fuse-link with controlled power dissipation, specifically engineered to protect medium voltage transformers in demanding electrical distribution systems. Designed in accordance with IEC 60282-1 and VDE 0670 T402, it delivers rapid interruption of high fault currents while minimising thermal stress on connected equipment.
Part of the trusted Mersen Limitor®-PTD series, the W1000266 features pure silver fuse elements, silver-plated copper end caps and a robust ceramic body for exceptional electrical performance and long operating life. Its integrated 80 N thermal striker provides reliable operation with compatible air and gas insulated switchgear, making it a preferred choice for modern transformer protection systems.
With a rated voltage of 12 kV AC, a 25 A current rating and a 56 mm × 292 mm DIN format, the W1000266 is ideally suited for industrial substations, utility networks and medium voltage transformer installations where dependable protection is essential.
Key Advantages
- Designed for reliable medium voltage transformer protection.
- Controlled power dissipation technology helps reduce thermal stress.
- 12 kV AC voltage rating for medium voltage distribution systems.
- 25 A current rating suitable for transformer primary protection.
- Integrated 80 N thermal striker for dependable switchgear operation.
- Manufactured to IEC 60282-1 and VDE 0670 T402 standards.
Key Features
- Mersen Limitor®-PTD back-up fuse-link.
- Catalogue number: 45DB120V25PTD.
- Rated voltage: 12 kV AC.
- Rated current: 25 A.
- Breaking capacity: 63 kA.
- Fuse dimensions: 56 mm diameter × 292 mm.
- Thermal striker: 80 N.
- Controlled power dissipation (PTD) design for enhanced transformer protection.
Medium voltage back-up fuse-links protect transformers by rapidly interrupting damaging fault currents before equipment can be exposed to excessive thermal or mechanical stress. This helps improve network reliability while reducing maintenance costs and equipment downtime.
The Mersen Limitor®-PTD range combines controlled power dissipation with dependable fault interruption, making it particularly well suited to modern air insulated and gas insulated switchgear used throughout industrial and utility power distribution networks.
Typical Applications
- Medium voltage transformer protection.
- Industrial substations.
- Gas insulated switchgear (GIS).
- Air insulated switchgear.
- Utility power distribution networks.
- Industrial electrical infrastructure.
