SIEMENS Automation & Drives has expanded the use of vacuum technology in its new large frame family of Sirius contactors, now available from Ramelec .
Sirius 3RT12 vacuum contactors are a suitable choice when significant value is placed on extremely high performance and availability, and increased personnel and plant safety.
When compared to conventional air contactors, they offer a significantly higher (double) electrical endurance. There are no arcs and no switching gases. This means that main contact wear and erosion are negligible.
Vacuum contactors are available in sizes S10 and S12 over all power classes from 110 to 250kW/400V. The technical and economic benefits of vacuum contactors are especially important in applications with a high switching frequency, for heavy-duty starting and for applications up to 1000V.