Each bank differs slightly, through a good summery is a blog post from 2010 (
http://mfc.elmberg.net/2010/03/07/kontantuttag-vad-galler-fo...). I am quite sure however that most is not law, but rather the banks trying to increase earnings by pushing customers to use credit cards over cash. However, if you ask the banks, they will say its to limit the number of robberies at banks. Given the speed that we are moving towards a cashless society, the truth is likely a mix of them all.
I picked Swedbanks number in my post above, mostly because they are focused on normal consumers and less so at businesses. The numbers are also fairly similar to other banks, with only a few hundred dollars in difference compared to other banks. Their exact numbers are written on their website (http://www.swedbank.se/privat/kort-och-betalningar/kort/om-k...). However, I couldn't find a link for the procedure with larger transactions. The best I could find is this news paper article (http://www.sydsvenskan.se/ekonomi/bankerna-stoppar-stora-utt...). I learned personally the procedure by calling my bank and going through the process myself.