ABL6TS25U Schneider Voltage transformer Description The ABL6TS25U (Schneider Electric, Phaseo Optimum ABL6TS series) is a single-phase mains voltage transformer designed primarily for supplying control circuits or other electrical loads, while isolating them from the primary (line) supply. Frequently Asked Questions About ABL6TS25U What does the ABL6TS25U model denote? “ABL6TS25U” is a safety / isolation transformer from Schneider Electric’s Phaseo Optimum ABL6TS series. It’s