Staircase timer switch is ideal for lighting circuits that need to be switched off automatically after a set time. (adjustable from 30 seconds to 20 minutes)
Internal microcontroller allowing six different operating modes, selectable via rotary selector. 
According to DIN18015-2, some operating modes include a shut-off warning which lets the user know that the light in the stairwell will switch off within 15 seconds. 
The lights may be switched on for up to 45 minutes which is useful, for example, to clean the stairwell.
One important feature of the device is the intelligent relay command of the ""zero crossing"" relay which optimises the enabling and disabling of the load, increasing the life time of the relay