Why Choose the Mersen S1018318 High Voltage DIN Back-up Fuse?
The Mersen S1018318 is a premium Limitor®-PTS high voltage DIN back-up fuse developed to provide reliable protection for medium voltage transformers and associated switchgear against damaging short-circuit currents. Manufactured to IEC 60282-1 and VDE T402 requirements, it incorporates Mersen's innovative low power dissipation technology and an integrated thermal striker to enhance operational reliability.
The Limitor®-PTS series uses advanced pure silver fuse elements, a ceramic fuse body and silver-plated copper terminals to deliver dependable fault interruption whilst reducing heat generation within the fuse compartment. Its patented thermal striker helps minimise overheating inside gas-insulated and air-insulated switchgear, making it ideal for modern transformer protection systems.
Rated at 12 kV AC and 125 A, the S1018318 features a 78 mm diameter, a 442 mm fuse length and an integrated 80 N thermal striker. It is widely used in utility substations, industrial power distribution systems and compact medium voltage switchgear from leading manufacturers.
Key Advantages
- Reliable high voltage transformer protection.
- 12 kV AC rated voltage for medium voltage applications.
- 125 A rated current for compatible transformer installations.
- Low power dissipation reduces heating within switchgear.
- Integrated 80 N thermal striker improves protection coordination.
- Designed for both gas-insulated and air-insulated switchgear.
Key Features
- Mersen Limitor®-PTS series.
- High voltage DIN back-up fuse.
- 12 kV AC IEC rated voltage.
- 125 A rated current.
- 80 kA maximum breaking capacity.
- 78 mm diameter × 442 mm length.
- Integrated 80 N thermal striker.
- Low switching voltage and reduced power losses.
- Suitable for indoor and outdoor installations.
- Clip-mounted cylindrical construction.
Medium voltage back-up fuses rapidly interrupt high fault currents before excessive thermal and mechanical forces can damage transformers and switchgear. Their current-limiting characteristics help improve equipment protection while reducing maintenance costs and network downtime.
The Mersen Limitor®-PTS range introduces low power dissipation technology together with a patented thermal striker to minimise heating inside switchgear compartments whilst maintaining dependable protection and coordination with compatible switching devices.
Typical Applications
- Medium voltage transformer protection.
- Gas-insulated switchgear (GIS).
- Air-insulated switchgear (AIS).
- Electrical substations.
- Industrial power distribution systems.
- Utility and renewable energy installations.
