Why Choose the Mersen Y1000268 High-Voltage Transformer Fuse?
The Mersen Y1000268, catalogue reference 45DB120V40PTD, 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 Mersen Limitor®-PTD series, it features controlled power dissipation and a thermal striker, making it ideal for use with gas-insulated and air-insulated high-voltage switchgear.
Rated at 12 kV AC and 40 A, the Y1000268 provides rapid current-limiting protection that interrupts high fault currents before they reach their maximum prospective peak. This helps reduce thermal and mechanical stress on transformers while improving the reliability of high-voltage distribution systems.
Manufactured using a ceramic body, pure silver fuse elements and silver-coated copper end caps, the fuse offers dependable long-term performance. Its DIN format measures 56 mm in diameter and 292 mm in length and incorporates an integrated 80 N thermal striker for operation with compatible switchgear mechanisms.
Key Advantages
- Reliable high-voltage transformer short-circuit protection.
- 12 kV AC voltage rating for medium- and high-voltage distribution systems.
- 40 A rated current for transformer protection applications.
- Controlled power dissipation for improved switchgear compatibility.
- Current-limiting operation helps minimise fault energy.
- Integrated 80 N thermal striker for indication and switchgear operation.
Key Features
- Mersen Limitor®-PTD DIN back-up fuse-link.
- Catalogue number: 45DB120V40PTD.
- Rated voltage: 12 kV AC.
- Rated current: 40 A.
- Breaking capacity: 63 kA.
- Minimum breaking current: 134 A.
- Total clearing I²t: 14 kA²s.
- Fuse dimensions: 56 mm diameter × 292 mm length.
- Thermal striker: 80 N.
- Suitable for gas-insulated and air-insulated switchgear.
The Mersen Y1000268 is designed to provide dependable protection for distribution transformers installed within medium- and high-voltage electrical networks. Its current-limiting characteristics reduce the energy released during severe electrical faults, helping extend the service life of transformers and associated switchgear.
The controlled power dissipation (PTD) design and integrated thermal striker make this fuse particularly suitable for use in modern gas-insulated and air-insulated switchgear assemblies where dependable coordination with switching devices is essential.
Typical Applications
- Distribution transformer protection.
- Medium- and high-voltage substations.
- Gas-insulated switchgear (GIS).
- Air-insulated switchgear (AIS).
- Industrial electrical distribution systems.
- Utility power networks.
