Why Choose the Mersen M209311 High Voltage Transformer Fuse?
The Mersen M209311 is a high performance Limitor®-P DIN high voltage back-up fuse-link designed to provide dependable short-circuit protection for medium voltage transformers. Manufactured in accordance with IEC 60282-1, it is intended for use in high voltage switchgear, controlgear and electrical distribution systems where reliable transformer protection is essential.
Manufactured under catalogue number 45DB120V40P, the M209311 features pure silver fuse elements, silver-coated copper end caps and a robust ceramic body to deliver long service life and dependable electrical performance. An integrated 80 N striker enables reliable operation with compatible medium voltage switchgear.
With a rated voltage of 12 kV AC, a rated current of 40 A and dimensions of 56 mm diameter × 292 mm length, the M209311 provides reliable transformer protection whilst reducing the effects of high fault currents on valuable electrical equipment.
Key Advantages
- High voltage DIN back-up fuse-link for transformer protection.
- 12 kV AC rated voltage.
- 40 A rated current.
- 63 kA breaking capacity.
- Integrated 80 N striker for switchgear operation.
- Current-limiting design helps reduce fault energy.
- Pure silver fuse elements with ceramic body construction.
- Designed for dependable protection of medium voltage transformers.
Key Features
- Mersen Limitor®-P back-up fuse series.
- Catalogue number: 45DB120V40P.
- 12 kV AC rated voltage.
- 40 A current rating.
- 56 mm diameter × 292 mm length.
- 63 kA maximum breaking capacity.
- 29 kA²s total clearing I²t.
- 125 A minimum breaking current.
- 80 N striker mechanism.
- DIN clip-mounted construction.
The Mersen M209311 rapidly interrupts high prospective short-circuit currents before they can damage transformers, switchgear and associated medium voltage equipment. Its current-limiting characteristics reduce thermal and mechanical stresses, helping improve system reliability and minimise maintenance costs.
Designed for installation within medium voltage switchgear, the Limitor®-P range combines dependable electrical performance with robust mechanical construction, making it suitable for utility substations, industrial facilities and OEM transformer protection systems.
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.
