Simply AST

Timed astronomical twilight switch with daily programming, 230 V AC power supply, 1 relay and DIN rail installation (2 modules).

What is an astronomical twilight switch?
An astronomical twilight switch is a device designed for digitally control the switching on and off of electrical circuits. Thanks to an internal program and a direct connection to the electrical system, the switch turns electricity on or off at a specific time or according to sunrise and sunset conditions. The astronomical twilight switch is particularly suitable for store lighting, illuminated signs, and fountains. 

How it works 
The astronomical twilight switch works thanks to software inside the device, which allows it to calculate when the sun rises and when it sets. This is possible thanks to programs inside the instrument that allow it to analyze the latitude and longitude at which the device is located, depending on the geographical area set. The astronomical twilight switch battery has a life of five years and can be easily replaced when exhausted thanks to the flap on the back of the device.

Use 
The program provides for turning on at dusk and turning off at dawn, and offers the possibility of setting nighttime shutdowns lasting a minimum of 30 minutes.

How the product looks like 
The device has the size of 2 DIN. There is a large backlit display on the front of the switch to display the date, time, relay status, and textual guidance.

Vemer also provides Micro AST, which has the size of 1 DIN.

Other power supplies are available for all models on request.