Why Choose the Mersen M1000143 High Voltage Transformer Fuse?
The Mersen M1000143 is a premium Limitor®-PT DIN high voltage back-up fuse-link engineered to provide dependable short-circuit protection for medium voltage transformers. Manufactured in accordance with IEC 60282-1, it forms part of Mersen's proven Limitor®-PT range with Controlled Power Dissipation (CPD), helping improve thermal performance whilst delivering reliable transformer protection in medium voltage distribution systems.
Constructed using pure silver fuse elements, silver-coated copper end caps and a durable ceramic body, the M1000143 delivers consistent electrical performance and long service life. Its integrated 80 N thermal striker provides dependable operation with compatible switchgear, enabling rapid fault indication and isolation.
With a rated voltage of 24 kV AC, a rated current of 25 A and dimensions of 56 mm diameter × 442 mm length, the M1000143 is ideally suited for protecting distribution transformers against damaging short-circuit currents whilst maintaining reliable operation of medium voltage electrical networks.
Key Advantages
- High voltage DIN back-up fuse-link for transformer protection.
- 24 kV AC rated voltage.
- 25 A rated current.
- Controlled Power Dissipation (CPD) technology reduces thermal loading.
- 63 kA breaking capacity.
- Integrated 80 N thermal striker.
- Pure silver fuse elements with ceramic body construction.
- Manufactured in accordance with IEC 60282-1.
Key Features
- Mersen Limitor®-PT back-up fuse series.
- Catalogue number: 45DB240V25PT.
- 24 kV AC rated voltage.
- 25 A current rating.
- 56 mm diameter × 442 mm length.
- 63 kA maximum breaking capacity.
- 5.2 kA²s total clearing I²t.
- 93 A minimum breaking current.
- 80 N thermal striker.
- Controlled Power Dissipation (CPD) design.
The Mersen M1000143 rapidly interrupts high prospective fault currents before they can damage transformers, switchgear and associated medium voltage equipment. Its current-limiting characteristics reduce thermal and mechanical stress, helping improve network reliability whilst minimising equipment downtime.
Controlled Power Dissipation technology reduces operating temperatures inside enclosed switchgear whilst maintaining dependable fault interruption. This makes the M1000143 particularly suitable for modern transformer protection schemes where compact switchgear design and thermal management are important.
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.
