Why Choose the Mersen F1000252 High-Voltage Back-Up Fuse?
The Mersen F1000252, catalogue reference 45DB240V6,3PD, is a high-voltage DIN back-up fuse-link designed to protect distribution transformers against the damaging effects of short-circuit currents. Part of the Mersen Limitor®-PD series, it provides dependable transformer protection while maintaining low power dissipation for medium-voltage switchgear installations.
Rated at 24 kV AC and 6.3 A, the F1000252 is intended for use in transformer protection systems where reliable fault interruption and compliance with IEC 60282-1 and VDE T402 are required. Its ceramic body, pure silver fuse elements and silver-plated copper terminals provide long-term electrical and mechanical reliability.
An integrated 80 N striker provides positive mechanical indication and can operate compatible switchgear trip mechanisms following fuse operation. The compact DIN construction makes the fuse suitable for modern air-insulated and gas-insulated switchgear.
Key Advantages
- High-voltage DIN back-up fuse for transformer protection.
- 24 kV AC rated voltage.
- 6.3 A rated current.
- 63 kA breaking capacity for dependable fault interruption.
- Integrated 80 N striker for indication and switchgear operation.
- Low power dissipation helps minimise switchgear heating.
- Ceramic construction with silver fuse elements.
- Suitable for industrial, commercial and utility medium-voltage installations.
Key Features
- Mersen Limitor®-PD back-up fuse series.
- Manufacturer item number F1000252.
- Catalogue number 45DB240V6,3PD.
- 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 32 W.
- Integrated 80 N striker indication system.
- DIN clip-mounted construction.
- Compliant with IEC 60282-1 and VDE T402.
The Mersen F1000252 rapidly interrupts high short-circuit currents before they can damage transformers and associated medium-voltage equipment. Its current-limiting characteristics reduce thermal and mechanical stress while providing dependable transformer protection in demanding installations.
As a back-up fuse-link, the F1000252 is intended for high fault-current interruption and should be coordinated with suitable overload protection. Correct selection should consider transformer rating, prospective fault current and switchgear requirements.
Typical Applications
- Distribution transformer protection.
- Medium-voltage substations.
- Industrial electrical distribution.
- Air-insulated switchgear.
- Gas-insulated switchgear.
- Utility power distribution networks.
- Renewable energy transformer installations.
- Commercial medium-voltage switchgear.
