SELEKTA 170 Top3 Theben Digital DIN Rail Time Switch 230 V ac, 1-Channel. The Theben time switch is a single channel DIN rail single pole double through(SPDT) device. It is an astronomical time switch with the weekly program and 56 memory locations. It is rated with 230VAC operating voltage and frequency ranges between 50Hz and 60Hz. The housing material of this switch is highly temperature resistant and self-extinguishing thermoplastic. This device safe transfers via optional Bluetooth low energy OBELISK top3. It is useful for industrial applications.