* Court decides risks were not explained - borrower's lawyer
* Swiss francs loans popular until 2008 due to low interest rates
* Repayments surged after franc soared and currency cap ended
* Decision could have wider implications in Europe
* Slovenia has 461 mln euros of outstanding Swiss franc loans (Updates with latest loan figure, paragraphs 2, 11)
By Marja Novak
LJUBLJANA, Jan 19 (Reuters) - A court in Slovenia has cancelled a Swiss franc real-estate loan because the high risks of such a currency deal were not explained, the borrower's lawyer said on Friday.
The decision puts as much as 461 million euros of loans held by Slovenian banks at risk and may have implications elsewhere in Europe.
Households and firms in Slovenia and elsewhere in Europe took out loans denominated in Swiss francs, mostly from 2004 to 2008, to benefit from low Swiss interest rates.
But their repayment obligations later soared due to a surge in the franc, particularly after Switzerland scrapped its cap on the currency in January 2015.
"This is a breakthrough decision. It is the first such decision in Slovenia and one of the first in the European Union," the lawyer, Robert Preininger, told Reuters.
"The main reason for such a decision is that banks were aware of high risks and of a possibility of depreciation of the Swiss franc but did not inform consumers of those risks while they expected to profit on that account. That was a very immoral business practice," he said.
Preininger declined to give details about the loan or borrower.
According to the court decision the borrower must repay the Slovenian unit of Austrian bank Sparkasse only the amount of loan received without any interest, Preininger said.
He said this meant the total repayment will be at least 60 percent lower than it would have been if the loan was not cancelled.
Sparkasse told Reuters it has not yet received the decision and gave no further comment. The court - the appellate High Court in Ljubljana - gave no immediate comment.
The Bank of Slovenia told Reuters later on Friday that the total outstanding amount of loans in Swiss francs fell to 461 million euros in November, down from 524 million euros in May 2017. They represented 7.2 percent of all real-estate loans but only 0.2 percent of all loans to companies.
The central bank gave no comment on the ruling.
According to local media a total of about 20,000 loans denominated in Swiss francs were given to individuals and companies by Slovenian banks. (Reporting By Marja Novak; Editing by Jeremy Gaunt and Elaine Hardcastle)