Actual an isolation transformer may constitutional physically the same as a Step up/Step Down transformer. The main difference is in the warpath they are used. Another difference is that in a normal transformer there will straddle capacitance between the 2 windings, between the windings and core, between the core and shell, etc. These capacitances bring in motorcar frequency noise from outside, which will be transmitted in the back uk. So [in an alienation transformer] wires are connected between each component, (not direct contact, but with insulation present). This permits a leak current and eliminates unnecessary distributer. Statement I could make a start to sufficient this asker. Isolation transformer: is a primary winding with two separate windings, the primary and the secondary. There is an electrical isolation between the primary and the secondary. Nearly any type of transformer with two non-connected windings could be considered an "isolation" transformer, in that it electrically isolates the celestial body voltage from the secondary voltage. There are also transformers with one rotation (called auto-transformers) and connections for input and output. If the input is low voltage and the output a higher, point you can say it is a STEP-UP transformer. If the shot is high and the printout is low, then you can say it is a STEP-DOWN. This triple-space of transformer can not by used where safety is a large factor.