Why Choose the Mersen L1000280 High Voltage Transformer Fuse?
The Mersen L1000280 is a high performance Limitor®-PTD DIN high voltage back-up fuse-link designed to protect medium voltage transformers against the thermal and dynamic effects of short-circuit currents. Manufactured for use with air-insulated and gas-insulated switchgear, it provides dependable protection in utility, industrial and infrastructure power distribution systems.
Part of Mersen's Limitor®-PTD range with controlled power dissipation, the L1000280 is manufactured using pure silver fuse elements, silver-coated copper end caps and a robust ceramic body. These carefully selected materials provide consistent electrical performance, high interruption capability and reliable operation in demanding medium voltage environments.
With a rated voltage of 24 kV AC, a rated current of 31.5 A and a compact 56 mm diameter × 442 mm length, the L1000280 is suitable for primary-side transformer protection. Its integrated 80 N thermal striker supports operation with compatible switchgear mechanisms and helps provide effective fault indication and isolation.
Key Advantages
- High voltage DIN back-up fuse-link designed for transformer protection.
- 24 kV AC rated voltage for medium voltage distribution systems.
- 31.5 A rated current.
- Controlled power dissipation supports dependable thermal performance.
- 65 kA breaking capacity for interruption of high prospective fault currents.
- Integrated 80 N thermal striker for compatible switchgear mechanisms.
- Manufactured in accordance with IEC 60282-1 and VDE 0670 T402.
- Suitable for air-insulated and gas-insulated medium voltage switchgear.
Key Features
- Mersen Limitor®-PTD back-up fuse series.
- 24 kV AC IEC rated voltage.
- 31.5 A ampere rating.
- 56 mm diameter fuse body.
- 442 mm fuse-link length.
- 65 kA maximum AC breaking capacity.
- 7 kA²s total clearing I²t at rated voltage.
- Integrated 80 N thermal striker.
- Pure silver fuse elements and silver-coated copper end caps.
- Durable ceramic fuse body for medium voltage applications.
High voltage back-up fuses such as the Mersen L1000280 are installed on the primary side of distribution transformers to interrupt high short-circuit currents. By rapidly limiting and clearing severe faults, the fuse helps protect transformers, switchgear and associated electrical equipment from damaging thermal and mechanical stresses.
The Limitor®-PTD design combines controlled power dissipation with a high breaking capacity and thermal striker mechanism. This makes the L1000280 suitable for coordinated protection schemes within modern medium voltage substations and industrial power distribution networks.
Typical Applications
- Primary-side protection of medium voltage transformers.
- Air-insulated medium voltage switchgear.
- Gas-insulated switchgear installations.
- Electrical distribution substations.
- Industrial power distribution systems.
- Utility transformer installations.
- Renewable energy and infrastructure projects.
