Why Choose the Mersen Y209344 High-Voltage Transformer Fuse?
The Mersen Y209344, catalogue reference 45DB240V32P, is a high-voltage DIN back-up fuse-link designed to protect distribution transformers against the damaging effects of short-circuit currents. As part of the established Mersen Limitor®-P series, it provides dependable current-limiting protection for high-voltage switchgear, controlgear and electrical distribution systems.
Rated at 24 kV AC and 31.5 A, the Y209344 rapidly interrupts substantial fault currents before they reach their maximum prospective peak. This helps reduce the electrical, thermal and mechanical stress applied to transformers, cables, conductors and associated high-voltage equipment during severe short-circuit conditions.
The fuse-link features a durable ceramic body, pure silver fuse elements and silver-plated copper terminals for reliable electrical performance. Its standard DIN fuse size measures 56 mm in diameter and 442 mm in length, while the integrated 80 N standard striker can operate compatible switchgear mechanisms or provide clear indication after the fuse has operated.
Key Advantages
- Dependable high-voltage transformer short-circuit protection.
- 24 kV AC rated voltage for high-voltage distribution systems.
- 31.5 A rated current for suitable transformer applications.
- High 63 kA breaking capacity for demanding fault conditions.
- Current-limiting operation helps reduce peak fault current and equipment stress.
- Integrated 80 N striker for switchgear operation or fuse indication.
Key Features
- Mersen Limitor®-P high-voltage DIN back-up fuse-link.
- Catalogue number: 45DB240V32P.
- Rated voltage: 24 kV AC.
- Rated current: 31.5 A.
- Breaking capacity: 63 kA.
- Minimum interrupting rating: 105 A.
- Total clearing I²t: 7 kA²s at rated voltage.
- Fuse size: 56 mm diameter × 442 mm length.
- Standard striker: 80 N.
- Pure silver fuse elements and silver-plated copper terminals.
Back-up fuse-links such as the Mersen Y209344 are designed to interrupt high short-circuit currents above their specified minimum interrupting level. They are typically coordinated with suitable switching devices or additional protective equipment to provide effective transformer protection throughout the required fault-current range.
During a severe electrical fault, the pure silver fuse elements operate rapidly within the ceramic body. This current-limiting action reduces the energy transferred into the protected system, helping minimise damage to transformers, conductors, cables and high-voltage switchgear.
Typical Applications
- High-voltage distribution transformer protection.
- HV/LV transformer installations.
- Electrical substations and utility networks.
- High-voltage switchgear and controlgear.
- Industrial electrical distribution systems.
- Transformer panels and fused switch combinations.
