Why Choose the Mersen X209297 High-Voltage Fuse?
The Mersen X209297, catalogue reference 45DB72V25PD, is a high-voltage DIN back-up fuse-link designed to protect distribution transformers against the damaging thermal and dynamic effects of short-circuit currents. It forms part of the dependable Mersen Limitor®-PD series, developed for high-voltage switchgear, controlgear and power distribution systems.
Rated at 7.2 kV AC and 25 A, this current-limiting fuse-link interrupts high fault currents quickly, helping prevent faults from developing to their maximum prospective peak. Its high breaking capacity, effective current limitation and low switching voltage support reliable transformer protection in demanding electrical installations.
The X209297 features a durable ceramic body, pure silver fuse elements and silver-plated copper end caps. Its standard DIN dimensions of 56 mm diameter × 192 mm length support straightforward clip mounting, while the integrated 80 N medium striker can operate compatible switchgear mechanisms or provide clear fuse-operation indication.
Key Advantages
- Reliable high-voltage transformer protection against short-circuit currents.
- 7.2 kV AC voltage rating for medium- and high-voltage distribution systems.
- 25 A current rating for coordinated transformer protection.
- High breaking capacity and effective current-limiting performance.
- Integrated 80 N medium striker for switchgear operation or indication.
- Robust ceramic construction with high-quality conductive materials.
Key Features
- Mersen Limitor®-PD back-up fuse-link.
- Catalogue number: 45DB72V25PD.
- Rated voltage: 7.2 kV AC.
- Rated current: 25 A.
- Fuse dimensions: 56 mm diameter × 192 mm length.
- Medium striker: 80 N / 30 mm.
- Pure silver fuse elements for consistent electrical performance.
- Silver-plated copper end caps and a durable ceramic body.
- Suitable for indoor and outdoor high-voltage applications.
Back-up fuse-links such as the Mersen X209297 are intended to interrupt high short-circuit currents that exceed their minimum breaking-current threshold. They are commonly coordinated with transformer protection devices or high-voltage switching equipment to provide comprehensive protection across the required fault-current range.
The current-limiting design helps interrupt a fault before it reaches its full prospective peak, reducing the electrical, thermal and mechanical stresses applied to transformers, cables and switchgear. Coordination with suitable high-voltage equipment is essential to achieve the required level of system protection.
Typical Applications
- High-voltage and medium-voltage transformer protection.
- HV/LV distribution transformer installations.
- Electrical substations and distribution networks.
- High-voltage switchgear and controlgear.
- Industrial power distribution systems.
- Indoor and outdoor transformer enclosures.
