Why Choose the Mersen Y1000245 High-Voltage Transformer Fuse?
The Mersen Y1000245, catalogue reference 45DB120V40PD, is a high-voltage DIN back-up fuse-link developed to protect distribution transformers against the damaging effects of short-circuit currents. Part of the trusted Mersen Limitor®-PD series, it is designed for reliable operation in high-voltage switchgear, controlgear and electrical distribution systems.
Rated at 12 kV AC and 40 A, the Y1000245 delivers rapid current-limiting protection, interrupting severe fault currents before they reach their maximum prospective peak. This helps minimise thermal, electrical and mechanical stress on transformers, cables and associated high-voltage equipment.
Manufactured using a durable ceramic body, pure silver fuse elements and silver-plated copper end caps, the fuse provides dependable long-term performance. Its DIN format measures 56 mm in diameter and 292 mm in length, while the integrated 80 N striker can operate compatible switchgear mechanisms or provide a clear indication after fuse operation.
Key Advantages
- Reliable high-voltage transformer short-circuit protection.
- 12 kV AC voltage rating for high-voltage distribution systems.
- 40 A rated current for transformer protection applications.
- Current-limiting operation reduces fault energy and equipment stress.
- High 63 kA breaking capacity for demanding installations.
- Integrated 80 N striker for switchgear operation or indication.
Key Features
- Mersen Limitor®-PD DIN back-up fuse-link.
- Catalogue number: 45DB120V40PD.
- Rated voltage: 12 kV AC.
- Rated current: 40 A.
- Breaking capacity: 63 kA.
- Minimum interrupting rating: 134 A.
- Fuse dimensions: 56 mm diameter × 292 mm length.
- 80 N striker for indication and switchgear operation.
- Pure silver fuse elements with silver-plated copper end caps.
- DIN clip-mounted design for compatible high-voltage installations.
Back-up fuse-links such as the Mersen Y1000245 are designed to interrupt high short-circuit currents above their specified minimum breaking-current threshold. When coordinated with suitable switching equipment, they provide dependable protection for transformers operating within medium- and high-voltage electrical distribution systems.
The current-limiting design reduces the energy transferred during a fault, helping to minimise damage to transformers, switchgear and associated electrical infrastructure while improving overall system reliability.
Typical Applications
- High-voltage distribution transformer protection.
- HV/LV transformer installations.
- Electrical substations.
- Industrial power distribution systems.
- High-voltage switchgear and controlgear.
- Utility distribution networks.
