Why Choose the Mersen Z209299 High-Voltage Transformer Fuse?
The Mersen Z209299, catalogue reference 45DB72V40PD, is a high-quality DIN high-voltage back-up fuse-link engineered to protect medium-voltage power transformers against the damaging effects of short-circuit currents. Part of the proven Mersen Limitor®-PD series, it is specifically designed for reliable transformer protection in industrial switchgear, substations and electrical distribution networks.
Rated at 7.2 kV AC and 40 A, the Z209299 delivers a maximum breaking capacity of 63 kA. Its current-limiting characteristics help minimise thermal and mechanical stress on transformers, cables and switchgear during fault conditions, improving equipment protection and system reliability.
Manufactured using a durable ceramic body, pure silver fuse elements and silver-plated copper terminals, the fuse complies with IEC 60282-1 and VDE 0670 T402. An integrated 80 N striker provides reliable operation indication and can actuate compatible switchgear tripping mechanisms.
Key Advantages
- DIN high-voltage back-up fuse-link for transformer protection.
- 7.2 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 design reduces fault energy.
- Integrated 80 N striker for indication and switchgear tripping.
- Pure silver fuse elements for consistent performance.
- Manufactured to IEC 60282-1 and VDE 0670 T402.
Key Features
- Mersen Limitor®-PD back-up fuse series.
- 7.2 kV AC IEC rated voltage.
- 40 A rated current.
- 63 kA maximum breaking capacity.
- 140 A minimum interrupting current.
- 14 kA²s clearing I²t.
- 30 W power dissipation.
- Mechanical striker with 80 N operating force.
- Silver-plated copper terminals.
- Ceramic body with pure silver fuse elements.
The Mersen Z209299 is engineered to interrupt high fault currents before they can damage transformer windings and associated switchgear. Its current-limiting characteristics reduce both thermal stress and electrodynamic forces, improving equipment reliability and reducing downtime.
As a back-up fuse-link, the Z209299 should be coordinated with suitable protection equipment for overload protection and lower-level overcurrents. It is ideally suited to transformer protection in industrial and utility medium-voltage installations.
Typical Applications
- Medium-voltage transformer protection.
- Industrial electrical distribution systems.
- High-voltage switchgear.
- Utility substations.
- Ring main units.
- Electrical infrastructure projects.
