Why Choose the Mersen P1000122 Limitor®-PT High Voltage Transformer Fuse?
The Mersen P1000122, catalogue number 45DB120V6,3PT, is a dependable high voltage DIN back-up fuse designed to protect medium-voltage transformers against damaging short-circuit currents. As part of the Mersen Limitor®-PT series, it combines reliable current-limiting performance with controlled power dissipation for use in high-voltage switchgear, controlgear and electrical distribution systems.
This fuse-link is manufactured using pure silver fuse elements, silver-plated copper terminals and a durable ceramic body. These premium materials support consistent electrical performance, effective fault interruption and long service life in demanding industrial and utility environments.
With a rated voltage of 12 kV AC and a rated current of 6.3 A, the P1000122 is suitable for medium-voltage transformer protection applications. Its 56 mm diameter DIN construction, clip mounting and integrated 80 N striker allow straightforward installation and mechanical operation of compatible switchgear trip or indication systems.
Key Advantages
- Specially designed for medium-voltage transformer protection.
- 12 kV AC voltage rating for high-voltage IEC systems.
- 6.3 A rated current for compatible transformer applications.
- Controlled power dissipation helps support efficient switchgear operation.
- Integrated 80 N striker for tripping and fuse operation indication.
- High 63 kA breaking capacity for dependable short-circuit interruption.
Key Features
- Mersen Limitor®-PT back-up fuse series.
- Catalogue number 45DB120V6,3PT.
- 12 kV AC IEC rated voltage.
- 6.3 A rated current.
- 63 kA maximum breaking capacity.
- 30 A minimum interrupting rating.
- 0.8 kA²s clearing I²t at rated voltage.
- Integrated striker-type indication system.
- Silver-plated copper cylindrical terminals.
- Robust ceramic insulating body.
Medium-voltage transformers require specialised protection capable of interrupting severe short-circuit currents before excessive thermal or mechanical damage occurs. The Mersen P1000122 is a current-limiting back-up fuse designed to operate rapidly during high fault conditions while coordinating with other protective equipment within the electrical installation.
Its controlled power dissipation design helps reduce heat generation within enclosed switchgear. The integrated striker can operate compatible trip mechanisms or signalling devices when the fuse has cleared a fault, supporting safe system isolation and efficient maintenance.
Typical Applications
- Medium-voltage transformer protection.
- High-voltage switchgear and controlgear.
- Electrical substations.
- Industrial power distribution systems.
- Utility transformer installations.
- OEM medium-voltage electrical equipment.
