Why Choose the Mersen Z209345 High-Voltage Transformer Fuse?
The Mersen Z209345, catalogue reference 45DB240V40P, is a high-performance DIN high-voltage back-up fuse-link developed to provide dependable protection for medium-voltage power transformers. As part of the Mersen Limitor®-P series, it is engineered to safely interrupt high short-circuit currents while minimising thermal and mechanical stress on transformers and associated switchgear.
Rated at 24 kV AC and 40 A, the Z209345 delivers a maximum breaking capacity of 63 kA. Its current-limiting characteristics help reduce fault energy, protecting valuable electrical equipment and improving the reliability of industrial and utility power distribution systems.
Manufactured using a ceramic body, pure silver fuse elements and silver-plated copper terminals, the fuse-link complies with IEC 60282-1. An integrated 80 N standard striker provides reliable operation indication and can actuate compatible switchgear tripping mechanisms.
Key Advantages
- DIN high-voltage back-up fuse-link for transformer protection.
- 24 kV AC rated voltage for medium-voltage systems.
- 40 A rated current for transformer applications.
- 63 kA breaking capacity for dependable fault interruption.
- Current-limiting operation reduces thermal and mechanical fault stress.
- Integrated 80 N striker for indication and switchgear tripping.
- Pure silver fuse elements for dependable long-term performance.
- Designed in accordance with IEC 60282-1.
Key Features
- Mersen Limitor®-P back-up fuse series.
- 24 kV AC IEC rated voltage.
- 40 A rated current.
- 63 kA maximum breaking capacity.
- 130 A minimum interrupting current.
- 22 kA²s clearing I²t.
- 114 W power dissipation.
- Standard 80 N striker.
- Silver-plated copper terminals.
- Ceramic insulating body with pure silver fuse elements.
The Mersen Z209345 rapidly interrupts severe short-circuit currents before they can damage transformer windings, switchgear and associated electrical equipment. Its current-limiting performance helps minimise peak fault current and thermal stress, improving the safety and reliability of medium-voltage power systems.
As a back-up fuse-link, the Z209345 should be coordinated with suitable overload protection devices to provide comprehensive transformer protection in industrial, commercial and utility installations.
Typical Applications
- Medium-voltage transformer protection.
- Industrial electrical distribution systems.
- Utility substations.
- Air insulated switchgear.
- Ring main units.
- Infrastructure and renewable energy installations.
