The analogue DIN rail time switches from the house of Grässlin allow switching commands in both daily program.
Restricted warranty on battery!:
A chargeable battery in
the timer allows to run the timer for 150h without power-grid, we GSE
strictly recommend to keep the battery charged min. once a year. The
battery have a restricted warranty of 14months from the date of the
production from GRÄSSLIN!
Specifications:
Current Output: Changeover,
Potential-free 
Inductive load ratings:  4A / 250VAC 
Ohmic
load ratings: 16A / 250VAC
Wiring option: Flat connection DIN 6.3
Accuracy: ± 2,5 Second /Day at 20°C 
Backup protection time:
> 150 Hours 
Manual switch: Automatic Mode, Fix ON/OFF
Program: Daily Program (ON/OFF) 
Shortest switching time:
ON/OFF 30-Minutes
Spare part for:
Timer Box II 
| Umax | 250V | 
|---|---|
| Contact Current | 16A |