Have you considered a mechanical timer? After a quick search I found this model in particular. The description says that it can handle up to 96 on/off-cycles with 15 minute incements.
In your case it would be used the following way:
Before you start the washing machine you need to set up the timer, so that it will switch off after the washing program cyle completed, i.e. the washing cycle lasts 2 h 30 min - you need to set the timer to 2 h 45 min (adding some tolerance)
The disadvantage would be that the timer had to be set up everytime before you use the washing machine - or you have to wash always at the same time (which probably will be impractical). Alternatively you just could unplug the power cord after using the washing machine, saving the effort to buy a timer.
Have you considered a mechanical timer? After a quick search I found this model in particular. The description says that it can handle up to 96 on/off-cycles with 15 minute incements.
In your case it would be used the following way: Before you start the washing machine you need to set up the timer, so that it will switch off after the washing program cyle completed, i.e. the washing cycle lasts 2 h 30 min - you need to set the timer to 2 h 45 min (adding some tolerance)
The disadvantage would be that the timer had to be set up everytime before you use the washing machine - or you have to wash always at the same time (which probably will be impractical). Alternatively you just could unplug the power cord after using the washing machine, saving the effort to buy a timer.