What is this component and where can I find more details?
This is a guess, but based on the label showing voltage and current, this is probably some kind of common mode choke or balun.  The current and voltage is much too high for the apparent size of this thing for it to be a transformer.  It looks way too small to transfer 125 VA from primary to secondary.

Just the picture alone could also suggest some kind of transformer for RF, but 250 V and 500 mA on the label means it's not.