Why Choose the Mersen X209343 High-Voltage Fuse?
The Mersen X209343, catalogue reference 45DB240V25P, is a high-voltage DIN back-up fuse-link designed to protect power distribution transformers against the damaging effects of short-circuit currents. Part of the established Mersen Limitor®-P series, it is suitable for use in high-voltage switchgear, controlgear and industrial power distribution systems.
Rated at 24 kV AC and 25 A, the X209343 provides rapid current-limiting protection during high fault-current conditions. By interrupting a short circuit before the prospective current reaches its maximum peak, the fuse helps reduce thermal and mechanical stress on transformers, cables and associated switchgear.
The fuse-link features a durable ceramic body, pure silver fuse elements and silver-plated copper end caps for dependable electrical performance. Its standard DIN format measures 56 mm in diameter and 442 mm in length, while the integrated 80 N striker can operate compatible switchgear mechanisms or provide indication when the fuse has operated.
Key Advantages
- Reliable high-voltage transformer protection against short-circuit currents.
- 24 kV AC rated voltage for high-voltage distribution installations.
- 25 A current rating for coordinated transformer protection.
- Current-limiting operation helps reduce peak fault-current stresses.
- High breaking capacity for demanding electrical distribution systems.
- Integrated 80 N striker for switchgear operation or indication.
Key Features
- Mersen Limitor®-P DIN back-up fuse-link.
- Catalogue number: 45DB240V25P.
- Rated voltage: 24 kV AC.
- Rated current: 25 A.
- Breaking capacity: up to 63 kA.
- Dimensions: 56 mm diameter × 442 mm length.
- Standard striker: 80 N.
- Pure silver fuse elements for consistent current interruption.
- Silver-plated copper end caps and a robust ceramic body.
High-voltage back-up fuse-links such as the Mersen X209343 are designed to interrupt substantial short-circuit currents above their specified minimum breaking-current level. They are typically coordinated with suitable switching devices or additional protection equipment to provide effective protection across the required operating range.
During a severe electrical fault, the current-limiting fuse elements operate rapidly and interrupt the current inside the ceramic fuse body. This reduces the energy passed into the protected equipment and helps minimise damage to transformers, conductors and high-voltage switchgear.
Typical Applications
- High-voltage distribution transformer protection.
- HV/LV power distribution installations.
- Electrical substations and utility networks.
- High-voltage switchgear and controlgear.
- Industrial power distribution systems.
- Transformer panels and fused switch combinations.
