The T7010 70 volt 10 watt line transformer has wattage taps. It has 10, 5, 2.5, 1.25, and 0.625 watt taps. It also offers color coded leads.
Multiple Wattage Taps: 10W, 5W, 2.5W, 1.25W, 0.625W
The MGT-28100 from MG Electronics is a class I open frame transformer.
Secondary: 28VAC 100VA
Open Frame Class I Transformer
Comes with AC line cord