Why Choose the Mersen A209346 High-Voltage Transformer Fuse?
The Mersen A209346, catalogue number 45DB240V50P, is a reliable DIN high-voltage back-up fuse designed to protect transformers against the damaging effects of short-circuit currents. Part of the proven Mersen Limitor®-P series, it is suitable for high-voltage switchgear, controlgear and power distribution systems.
Rated at 24 kV AC and 50 A, the A209346 provides rapid current-limiting protection during severe electrical faults. By restricting the peak fault current and energy passed into the protected circuit, it helps reduce thermal and mechanical stress on transformer windings, cables and associated switchgear.
The fuse is manufactured using pure silver fuse elements, silver-coated copper end caps and a robust ceramic body for dependable performance in demanding installations. Its 56 × 442 mm DIN format is designed for compatible clip-mounted fusegear, while an integrated 80 N striker provides fuse-operation indication and can actuate suitable switchgear mechanisms.
Key Advantages
- Designed specifically for high-voltage transformer protection.
- 24 kV AC rated voltage for medium-voltage systems.
- 50 A rated current.
- High current limitation helps reduce damaging fault energy.
- Rapid interruption of high short-circuit currents.
- Integrated 80 N striker for indication and switchgear actuation.
- Robust ceramic body with pure silver fuse elements.
- Suitable for indoor and outdoor high-voltage applications.
Key Features
- Mersen Limitor®-P transformer back-up fuse.
- Manufacturer part number: A209346.
- Catalogue number: 45DB240V50P.
- Rated voltage: 24 kV AC.
- Rated current: 50 A.
- Fuse diameter: Approximately 56 mm.
- Fuse length: Approximately 442 mm.
- Striker force: 80 N.
- Design classification: VDE T4.
- Clip mounting with cylindrical terminals.
The Mersen A209346 protects transformers by interrupting high short-circuit currents before they can cause extensive damage. Its current-limiting design reduces the peak current and total fault energy experienced by transformer windings, cables and high-voltage switchgear.
As a back-up fuse, the A209346 is intended primarily to interrupt high-value fault currents. It must be coordinated with appropriate switching or protective equipment to provide complete protection across the required operating current range.
Typical Applications
- Medium-voltage distribution transformer protection.
- High-voltage switchgear and controlgear.
- Transformer substations.
- Industrial power distribution systems.
- Utility and infrastructure installations.
- Indoor and outdoor high-voltage equipment.
- Fuse-switch combinations for transformer circuits.
