Why Choose the Mersen L1000119 High Voltage DIN Back-up Fuse?
The Mersen L1000119 is a high quality DIN high voltage back-up fuse designed to protect medium voltage transformers against damaging short-circuit currents. Part of the advanced Mersen Limitor®-PT series, it combines reliable current-limiting protection with Controlled Power Dissipation (CPD) technology for efficient operation in high voltage switchgear and controlgear.
Manufactured in accordance with IEC 60282-1 and the VDE T4 design, the L1000119 is constructed using pure silver fuse elements, silver-plated copper terminals and a robust ceramic body. These premium materials support dependable fault interruption, low electrical losses and long-term performance in demanding medium voltage installations.
With a rated voltage of 12 kV AC, a rated current of 1 A and an integrated 80 N striker, the Mersen L1000119 is particularly suited to transformer protection circuits requiring a low current rating. Its standard 56 mm diameter and 292 mm fuse size enables installation within compatible DIN fuse clips and switchgear assemblies.
Key Advantages
- Designed specifically for medium voltage transformer protection.
- 12 kV AC rated voltage for high voltage electrical systems.
- 1 A rated current for compatible low-current transformer circuits.
- Controlled Power Dissipation technology helps minimise operating losses.
- Integrated 80 N striker for compatible switchgear mechanisms.
- High 63 kA breaking capacity for dependable fault interruption.
Key Features
- Mersen Limitor®-PT high voltage DIN back-up fuse.
- Catalogue number: 45DB120V1PT.
- 12 kV AC rated voltage.
- 1 A rated current.
- 56 mm diameter and 292 mm fuse size.
- Integrated striker indication system.
- Clip mounting with cylindrical terminals.
- Controlled Power Dissipation design.
High voltage back-up fuse-links interrupt substantial short-circuit currents before they can cause severe thermal or mechanical damage to transformers, switchgear and associated electrical equipment. Their current-limiting operation restricts the peak fault current and reduces the energy transferred into the protected circuit.
The Mersen Limitor®-PT range combines dependable transformer protection with Controlled Power Dissipation technology. This helps reduce heat generation during normal operation, making the fuse suitable for compact medium voltage switchgear where efficient thermal management is important.
Typical Applications
- Medium voltage transformer protection.
- Voltage transformer primary circuits.
- Control power transformer protection.
- High voltage switchgear assemblies.
- Utility substations and distribution networks.
- Industrial medium voltage power systems.
