Isolation transformers have many uses. Google is your friend, punch in what model you ended up with and it's specs. Start with the link below for an explanation to the basics:
http://www.shure.com/americas/support/find-an-answer/transformers-when-to-use-and-how-does-it-work
http://www.shure.com/americas/support/find-an-answer/transformers-when-to-use-and-how-does-it-work