I'm using the RAC02-GB (Datasheet) as an AC/DC converter and I'm confused about the protection circuit they included in the datasheet:
I want to make sure the AC/DC converter has the proper external protections but I'm a bit baffled by the datasheet's directions. I'm assuming the component labeled 'F' is a fuse but I'm not sure what the component labeled 'U' is. The datasheet lists the parameter "input fuse" as "internal" does that mean the protection circuit is already included in the converter and I don't need any external circuitry?
If I do need external circuitry, how do I spec the fuse and/or the component labeled 'U'?