Why Choose the Mersen X1000129 Limitor®-PT High Voltage Back-up Fuse?
The Mersen X1000129 is a premium Limitor®-PT high voltage DIN back-up fuse-link with controlled power dissipation, specifically engineered for protecting medium voltage transformers against short-circuit faults. Manufactured in accordance with IEC 60282-1, it combines dependable fault interruption with reduced thermal loading, making it ideal for modern medium voltage switchgear installations.
Part of the trusted Mersen Limitor®-PT range, the X1000129 features pure silver fuse elements, silver-plated copper terminals and a robust ceramic body to deliver excellent electrical performance and a long operating life. The integrated 80 N controlled power dissipation (CPD) striker provides reliable operation with compatible switchgear and transformer protection equipment.
Rated at 12 kV AC with a 50 A current rating, the X1000129 is supplied in a compact 56 mm × 292 mm DIN format, making it suitable for transformer protection in industrial substations, utility networks and medium voltage distribution systems.
Key Advantages
- Designed specifically for medium voltage transformer protection.
- Controlled power dissipation technology helps reduce thermal loading.
- 12 kV AC rated voltage for medium voltage electrical systems.
- 50 A rated current for transformer primary protection.
- Integrated 80 N CPD striker for dependable switchgear operation.
- Manufactured using premium silver fuse elements and ceramic construction.
Key Features
- Mersen Limitor®-PT back-up fuse-link.
- Catalogue number: 45DB120V50PT.
- Rated voltage: 12 kV AC.
- Rated current: 50 A.
- Breaking capacity: 63 kA.
- Fuse dimensions: 56 mm diameter × 292 mm length.
- 80 N controlled power dissipation striker.
- Designed for transformer protection in medium voltage switchgear.
Medium voltage back-up fuse-links rapidly interrupt damaging fault currents before they can affect transformers and associated switchgear. Controlled power dissipation technology reduces operating temperatures within enclosed switchgear, improving equipment reliability and extending service life.
The Mersen Limitor®-PT range has been developed for dependable transformer protection in industrial facilities, substations and utility distribution networks where consistent performance and reduced thermal stress are essential.
Typical Applications
- Medium voltage transformer protection.
- Industrial substations.
- Medium voltage switchgear.
- Utility distribution networks.
- Commercial power distribution.
- Renewable energy infrastructure.
