Why Choose the Mersen M1000258 High Voltage Transformer Fuse?
The Mersen M1000258 is a premium Limitor®-PD DIN high voltage back-up fuse-link engineered to provide reliable short-circuit protection for medium voltage transformers. Manufactured in accordance with IEC 60282-1 and VDE 0670 T402, it forms part of Mersen's trusted Limitor®-PD range for protecting transformers installed within medium voltage switchgear and electrical distribution systems.
Constructed using pure silver fuse elements, silver-coated copper end caps and a durable ceramic body, the M1000258 delivers dependable electrical performance and long service life. Its integrated 80 N thermal striker provides reliable operation with compatible switchgear, enabling effective fault indication and isolation.
With a rated voltage of 24 kV AC, a rated current of 40 A and dimensions of 56 mm diameter × 442 mm length, the M1000258 is ideally suited for protecting distribution transformers against damaging short-circuit currents whilst maintaining reliable operation of medium voltage electrical systems.
Key Advantages
- High voltage DIN back-up fuse-link for transformer protection.
- 24 kV AC rated voltage.
- 40 A rated current.
- Designed to IEC 60282-1 and VDE 0670 T402.
- 63 kA maximum breaking capacity.
- Integrated 80 N thermal striker.
- Pure silver fuse elements with ceramic body construction.
- Suitable for medium voltage transformer and switchgear applications.
Key Features
- Mersen Limitor®-PD back-up fuse series.
- Catalogue number: 45DB240V40PD.
- 24 kV AC rated voltage.
- 40 A current rating.
- 56 mm diameter × 442 mm length.
- 63 kA maximum breaking capacity.
- 14.2 kA²s total clearing I²t.
- 161 A minimum breaking current.
- 80 N thermal striker.
- DIN clip-mounted construction.
The Mersen M1000258 rapidly interrupts high prospective fault currents before they can damage transformers, switchgear and associated medium voltage equipment. Its current-limiting characteristics help minimise thermal and mechanical stress, improving system reliability whilst reducing downtime following electrical faults.
The Limitor®-PD range is specifically designed for transformer protection applications where dependable interruption of high fault currents is essential. Its robust construction and integrated thermal striker make the M1000258 suitable for utility substations, industrial installations and OEM medium voltage switchgear.
Typical Applications
- Medium voltage transformer protection.
- Utility substations.
- Industrial power distribution systems.
- Medium voltage switchgear.
- Electrical infrastructure projects.
- Renewable energy installations.
- Commercial power distribution equipment.
