Why Choose the Mersen F1000275 High-Voltage Back-Up Fuse?
The Mersen F1000275, catalogue reference 45DB240V6,3PTD, is a high-voltage DIN back-up fuse-link developed for protecting distribution transformers against the thermal and dynamic effects of short-circuit currents. Part of the Mersen Limitor®-PTD series, it combines controlled power dissipation with an integrated thermal striker, making it ideal for modern air-insulated and gas-insulated medium-voltage switchgear.
Rated at 24 kV AC with a 6.3 A current rating, the F1000275 is engineered to provide dependable transformer protection while minimising heat generation inside enclosed switchgear. Manufactured using a ceramic insulating body, pure silver fuse elements and silver-plated copper terminals, it delivers excellent electrical performance and long service life.
The fuse incorporates an integrated 80 N thermal striker that provides clear operation indication and can activate compatible switchgear mechanisms. Its low power dissipation characteristics make it particularly suitable for compact switchgear installations where thermal management is critical.
Key Advantages
- High-voltage DIN back-up fuse for transformer protection.
- 24 kV AC rated voltage.
- 6.3 A rated current.
- Controlled power dissipation reduces switchgear heating.
- 63 kA breaking capacity for reliable fault interruption.
- Integrated 80 N thermal striker.
- Ceramic construction with silver fuse elements.
- Recommended for use with compatible air-insulated and gas-insulated switchgear.
Key Features
- Mersen Limitor®-PTD series.
- Manufacturer item number F1000275.
- Catalogue number 45DB240V6,3PTD.
- 24 kV AC IEC rated voltage.
- 6.3 A rated current.
- 63 kA maximum breaking capacity.
- 23 A minimum breaking current.
- Total clearing I²t of 0.8 kA²s.
- Power dissipation of approximately 31 W.
- Integrated thermal striker with 80 N operating force.
- DIN clip-mounted construction.
- Controlled power dissipation technology.
The Mersen F1000275 rapidly interrupts high short-circuit currents before they can damage transformers and associated switchgear. Its controlled power dissipation technology reduces the heat generated during normal operation while maintaining excellent current-limiting performance during fault conditions.
As a back-up fuse-link, the F1000275 should be coordinated with suitable overload protection and selected according to transformer rating, prospective fault current and switchgear design to ensure optimum protection and reliability.
Typical Applications
- Distribution transformer protection.
- Medium-voltage substations.
- Air-insulated switchgear.
- Gas-insulated switchgear.
- Industrial electrical distribution.
- Utility power networks.
- Renewable energy transformer installations.
- Commercial medium-voltage switchgear.
