Why Choose the Mersen E1032957 High-Voltage Back-Up Fuse?
The Mersen E1032957, catalogue reference 45DB240V40PTS, is a high-voltage DIN back-up fuse-link developed to provide dependable protection for distribution transformers and medium-voltage electrical systems. As part of the Mersen Limitor®-PTS series, it combines low power dissipation with an integrated thermal striker, making it ideal for modern air-insulated and gas-insulated switchgear installations.
Rated at 24 kV AC with a 40 A current rating, this fuse-link is specifically designed to protect transformers against the thermal and mechanical effects of high short-circuit currents. The innovative Limitor®-PTS construction reduces heat generation while maintaining excellent current-limiting performance and long-term reliability.
Manufactured using a high-strength ceramic body, pure silver fuse elements and silver-plated copper terminals, the E1032957 also incorporates an 80 N thermal striker that provides reliable fault indication and can operate compatible switchgear mechanisms when required.
Key Advantages
- High-voltage DIN back-up fuse for transformer protection.
- 24 kV AC rated voltage for medium-voltage systems.
- 40 A rated current.
- Low power dissipation design reduces switchgear heating.
- Integrated 80 N thermal striker.
- 65 kA breaking capacity for reliable fault interruption.
- Suitable for air-insulated and gas-insulated switchgear.
- Manufactured using ceramic, pure silver and silver-plated copper components.
Key Features
- Mersen Limitor®-PTS series.
- 24 kV AC IEC rated voltage.
- 40 A rated current.
- 65 kA maximum breaking capacity.
- 161 A minimum breaking current.
- Total clearing I²t of 14.2 kA²s.
- Power dissipation of approximately 96 W.
- Integrated thermal striker with 80 N operating force.
- Low-loss fuse element design.
- Clip-mounted DIN construction.
- Suitable for transformer protection applications.
The Mersen E1032957 is engineered to rapidly interrupt high fault currents before they can damage transformers, switchgear or associated equipment. Its current-limiting design reduces thermal and mechanical stress, helping extend equipment life and improve system reliability.
The Limitor®-PTS range also features reduced power losses compared with conventional high-voltage fuse-links, helping minimise temperature rise inside compact switchgear assemblies while maintaining dependable protection performance.
Typical Applications
- Distribution transformer protection.
- Medium-voltage substations.
- Air-insulated switchgear.
- Gas-insulated switchgear.
- Industrial electrical distribution.
- Renewable energy transformer installations.
- Utility power distribution systems.
- Medium-voltage feeder protection.
