AC Transformer Power Cable
What you're looking for is some kind of IEC Power Entry component.
Digi-Key and other distributors have tons, with or without fuses, and with and without protective earthing.
Personally, I like using the ATX power supply style IEC C-14 connectors, because I have tons of those cables laying around.
This one also has a built-in fuse holder (remember to also get fuses!)
http://www.digikey.com/product-detail/en/723W-X2%2F03/Q205-ND/245546