SUL 189 s- Analogue Time Switch. SUL 189 s is an analogue time switch for daily programming. Features and Benefits. 1 Channel Power reserve (NiMh rechargeable battery) Quartz controlled 96 Switching segments Shortest switching time: 15 min Clock hands for time display Switching preselection Permanent On/Off switch Switching status display Simple summer/winter time correction - Time can be changed clockwise or anti clockwise