I have been unable to find a datasheet for this transistor marked F N G27 SSS 20N60. I thought the F was a Fairchild logo but did not get any results from a search on their website.
Thanks vtech. I have had this datasheet for some time but was confused by the "package marking and ordering information" on page 2 which specifies FCPF20N60 as the device marking. Fairchild usually put the complete part number as shown in the images attached, or an abbreviated number in the case of devices with long part numbers like IGBTs.
These devices are sold by a local spare parts dealer, probably obtained from China.