Why Choose the Mersen Z1000269 High-Voltage Transformer Fuse?
The Mersen Z1000269, catalogue reference 45DB120V50PTD, is a premium DIN high-voltage back-up fuse-link developed for reliable protection of medium-voltage power transformers. As part of the Mersen Limitor®-PTD series, it combines controlled power dissipation with an integrated thermal striker to provide dependable fault protection for transformer installations using air or gas insulated switchgear.
Rated at 12 kV AC and 50 A, the fuse-link delivers outstanding current-limiting performance with a 63 kA breaking capacity. It is specifically engineered to minimise the thermal and dynamic effects of high fault currents, helping to extend the service life of transformers and associated switchgear.
Manufactured using a high-strength ceramic body, pure silver fuse elements and silver-plated copper terminals, the Z1000269 complies with IEC 60282-1 and VDE T402 requirements. The integrated 80 N thermal striker provides positive indication of fuse operation and can be used to activate compatible switchgear trip mechanisms.
Key Advantages
- DIN high-voltage back-up fuse for transformer protection.
- 12 kV AC voltage rating for medium-voltage distribution networks.
- 50 A rated current for transformer applications.
- 63 kA breaking capacity for dependable fault interruption.
- Controlled power dissipation improves long-term reliability.
- Integrated 80 N thermal striker for indication and switchgear tripping.
- Ceramic construction with pure silver fuse elements.
- Designed to IEC 60282-1 and VDE T402 standards.
Key Features
- Mersen Limitor®-PTD back-up fuse series.
- 12 kV AC IEC rated voltage.
- 50 A current rating.
- 63 kA maximum breaking capacity.
- 190 A minimum interrupting rating.
- 25 kA²s clearing I²t.
- 62 W power dissipation at rated current.
- Integrated thermal striker with 80 N operating force.
- Clip mounting with cylindrical terminals.
- Silver-plated copper terminals and ceramic body.
The Mersen Z1000269 is designed to rapidly interrupt high short-circuit currents before they can cause significant damage to transformers and associated equipment. Its current-limiting performance helps reduce both thermal stress and electrodynamic forces within the electrical installation, improving overall system reliability.
The Limitor®-PTD range is recommended for transformer protection in conjunction with air or gas insulated switchgear and is widely used throughout industrial facilities, utility substations and electrical infrastructure projects.
Typical Applications
- Medium-voltage transformer protection.
- Gas insulated switchgear (GIS).
- Air insulated switchgear.
- Industrial power distribution systems.
- Utility substations.
- Renewable energy and infrastructure projects.
