SIEMENS Sirius 3RT is a modular system of contactors, overload relays, motor starter protectors, control relays and timers with a compact design to save cabinet space and speed installation. The new contactor sizes complement the original Sirius 3R control family of devices rated up to 100A. As with the original products, all of the large frame devices are optimally matched mechanically and electrically, enabling users to build starter systems quickly and easily.

The history of Telemecanique, related through its inventions, began with the marketing of the first bar contactor. A patent was registered in 1924, the same year as its acquisition. The brand then rapidly expanded its activities to become the leading specialist in automation management. It notably developed D contactors which became a global reference.