Programmable twilight switch for switching electrical consumers (such as lighting systems) on/off based on sunrise and sunset times without using a light sensor. The sunrise/sunset times are automatically calculated by the IC Astro based on the geographical data. Programming is done on the device or using the Acti 9 Light and Time Switch smartphone app via Bluetooth stick. The Bluetooth stick is also used as a memory card. Can also be programmed via PC using the CCT15860 programming kit. External input as an extension per channel. Adjustable threshold value from 1-99,000 lux. Quick start guide in the storage compartment. For mounting on TH35 top hat rails in accordance with EN 60715. Functions -84 memory locations. Display of astro times for the current day. Display of switching behavior in a freely selectable period. Offset input of different sunrise/sunset times (+/- 120 minutes. 3 astro modes Evening on, morning off. Evening off, morning on. Inactive, only timer is active. Position setting (via coordinates or by entering the country/city). Automatic switching from summer to winter time. Operating hours counter Display of operating hours per channel. Permanent switching on/off. Manual switching. Holiday function. Permanent display on the LCD display of hours and minutes, day of the week. Display background lighting. PIN coding. Nominal voltage AC 230, -15%/+10%, 50/60 Hz. Switching capacity max 16 A, AC 250 V, cos phi1, 10 A, AC 250 V, cos phi0.6. Switching capacity min 10 mA, AC 230 V, 100 mA, AC/DC 24 V. Contact potential-free. Standby power 0.3 W. Light bulb load 2600 W. Halogen lamp load 2600 W. Fluorescent lamp load not compensated 2300 VA, series compensated 2300 VA, parallel compensated 730 VA (80 uF). Compact fluorescent lamps 170 W. LED 2 W 200 W. External inputs 1 per channel. Connections screw terminals, rigid/flexible 2x0.5 - 2.5 mm2, with wire end ferrule max. 1x2.5 mm2. Controls 4 buttons for menu navigation. Accuracy 7+/-0.25 s/day (25 degrees C). Power reserve 10 years. Protection class device IP 20. Device width 2.5 HP approx. 45 mm.