Why Choose the Mersen W1000105 High Voltage DIN Back-up Fuse?
The Mersen W1000105 is a dependable Limitor®-P high voltage DIN back-up fuse designed to protect transformers and associated medium voltage equipment against damaging short-circuit currents. Also identified by catalogue number 45DB120V4P, it is suitable for high voltage switchgear, controlgear and electrical distribution systems.
Manufactured in accordance with IEC 60282-1, the W1000105 provides reliable current limitation and fault interruption in demanding industrial and utility installations. Its pure silver fuse elements, silver-plated copper terminals and robust ceramic body support consistent electrical performance and long operational life.
With a rated voltage of 12 kV AC, a rated current of 4 A and an integrated 80 N striker, the Mersen W1000105 is suitable for transformer feeders and medium voltage protection assemblies. Its standard 56 mm diameter by 292 mm fuse-link size enables installation in compatible DIN fuse bases and switchgear systems.
Key Advantages
- Designed specifically for medium voltage transformer protection.
- 12 kV AC IEC rated voltage for high voltage distribution systems.
- 4 A rated current for compatible transformer circuits.
- 63 kA breaking capacity provides dependable fault interruption.
- Integrated 80 N striker supports indication and switchgear operation.
- Premium ceramic and silver construction provides reliable long-term performance.
Key Features
- Mersen Limitor®-P series.
- Catalogue number: 45DB120V4P.
- 12 kV AC IEC rated voltage.
- 4 A rated current.
- DIN high voltage back-up fuse for transformer protection.
- 80 N standard striker mechanism.
- Pure silver fuse elements with silver-plated copper terminals.
- VDE T4 design for medium voltage applications.
High voltage back-up fuses protect transformers, cables and switchgear by limiting and interrupting substantial short-circuit currents before they cause serious thermal or mechanical damage. The Mersen W1000105 is engineered to remain stable during normal transformer operation while responding effectively when a high-level electrical fault occurs.
The integrated striker provides a clear indication when the fuse has operated and can actuate a compatible switchgear mechanism. This supports coordinated circuit isolation, faster fault identification and safer maintenance within medium voltage power distribution systems.
Typical Applications
- Medium voltage distribution transformer protection.
- High voltage switchgear and controlgear.
- Electrical distribution substations.
- Ring main units and transformer feeders.
- Industrial medium voltage power systems.
- Utility and infrastructure distribution networks.
