Why Choose the Mersen V1000265 High Voltage DIN Back-up Fuse?
The Mersen V1000265 is a high-performance Limitor®-PTD high voltage DIN back-up fuse designed to protect transformers against the thermal and dynamic effects of short-circuit currents. Also identified by catalogue number 45DB120V20PTD, it is engineered for use with air-insulated and gas-insulated medium voltage switchgear.
Manufactured in accordance with IEC 60282-1 and VDE 0670 T402, the V1000265 combines dependable fault interruption with Controlled Power Dissipation technology. Its ceramic body, pure silver fuse elements and silver-plated copper terminals provide reliable electrical performance and long-term durability in demanding power distribution environments.
With a rated voltage of 12 kV AC, a rated current of 20 A and an integrated 80 N thermal striker, the Mersen V1000265 is ideally suited to transformer feeders, substations and medium voltage switchgear assemblies requiring secure and predictable short-circuit protection.
Key Advantages
- Purpose-designed for medium voltage transformer protection.
- 12 kV AC rated voltage for high voltage distribution systems.
- 20 A rated current for compatible transformer circuits.
- Controlled Power Dissipation helps improve protection and operational reliability.
- Integrated 80 N thermal striker supports indication and switchgear operation.
- High 63 kA breaking capacity enables dependable short-circuit interruption.
Key Features
- Mersen Limitor®-PTD series.
- Catalogue number: 45DB120V20PTD.
- 12 kV AC IEC rated voltage.
- 20 A rated current.
- DIN high voltage back-up fuse construction.
- 80 N integrated thermal striker.
- Pure silver fuse elements with silver-plated copper terminals.
- Compliant with IEC 60282-1 and VDE 0670 T402.
High voltage back-up fuses help protect transformers, cables and switchgear by rapidly limiting damaging short-circuit currents. The Mersen V1000265 is designed to operate reliably during high-level faults while remaining stable under normal transformer operating conditions.
Its integrated thermal striker provides a clear indication when the fuse has operated and can actuate compatible switchgear mechanisms. This supports coordinated three-phase isolation, faster fault identification and safer maintenance within medium voltage power distribution systems.
Typical Applications
- Medium voltage distribution transformer protection.
- Air-insulated switchgear.
- Gas-insulated switchgear.
- Electrical distribution substations.
- Ring main units and transformer feeders.
- Industrial and utility power distribution networks.
