Why Choose the Mersen H1000277 High-Voltage Fuse?
The Mersen H1000277, catalogue number 45DB240V16PTD, is a high-voltage DIN back-up fuse-link designed to protect medium-voltage transformers against damaging short-circuit currents. Part of the advanced Mersen Limitor®-PTD range, it combines controlled power dissipation with an integrated 80 N thermal striker, making it ideal for modern air-insulated and gas-insulated switchgear installations.
Rated at 24 kV AC and 16 A, the H1000277 delivers rapid current-limiting interruption during severe electrical faults, helping to minimise thermal and mechanical stress on transformers, switchgear, busbars and associated distribution equipment. Its controlled power dissipation design helps reduce operating temperatures inside compact switchgear compartments.
Manufactured with a durable ceramic body, pure silver fuse elements and silver-coated copper end caps, the fuse incorporates an 80 N thermal striker capable of operating compatible switchgear mechanisms or providing fuse operation indication. The DIN-format fuse measures approximately 56 mm in diameter and 442 mm in length.
Key Advantages
- Designed specifically for medium-voltage transformer protection.
- 24 kV AC rated voltage for industrial and utility distribution systems.
- 16 A rated current.
- Controlled power dissipation improves thermal performance.
- Current-limiting operation helps minimise fault energy.
- Integrated 80 N thermal striker enhances switchgear protection.
- Suitable for both air-insulated and gas-insulated switchgear.
- Manufactured using premium ceramic, silver and copper materials.
Key Features
- Mersen Limitor®-PTD back-up fuse series.
- 24 kV AC IEC rated voltage.
- 16 A rated current.
- 63 kA maximum breaking capacity.
- 73 A minimum breaking current.
- 2.3 kA²s clearing I²t.
- 42 W power dissipation at rated current.
- 56 mm fuse diameter.
- 442 mm fuse length.
- 80 N thermal striker.
- Pure silver fuse elements.
- Silver-coated copper end caps with ceramic body.
The Mersen H1000277 belongs to the Limitor®-PTD family of transformer protection fuses. Its controlled power dissipation design helps reduce heat generation during normal operation while maintaining excellent current-limiting performance during severe short-circuit faults. This makes it particularly suitable for compact switchgear installations.
The integrated thermal striker provides additional protection by operating compatible switchgear mechanisms if excessive temperatures develop within the fuse compartment, helping improve operational safety and equipment reliability.
Typical Applications
- Medium-voltage transformer protection.
- Gas-insulated switchgear (GIS).
- Air-insulated switchgear.
- Transformer feeder panels.
- Industrial electrical distribution systems.
- Utility substations.
- Fuse-switch combination units.
- Infrastructure power distribution.
