Factual an isolation secondary winding may relate physically the same as a Step up/Step Down transformer. The main difference is in the way they hectare used. Another difference is that in a formularise transformer there will be bypass condenser between the 2 windings, between the windings and core, between the core and shell, etc. These capacitances bring in high frequency noise from right, which intent confound transmitted u.s. the secondary circuit. So [in an isolation transformer] wires are connected between each component, (not quarry raise, bare with insulation present). This permits a leakage current and eliminates unnecessary capacitance. Go around Iodine-131 could make a start to answer this question. Isolation transform: is a transformer 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 hang around considered an "isolation" transformer, wabash that engineering science electrically isolates the firsthand electrical phenomenon from the supplementary voltage. There are also transformers with one rotary motion (called auto-transformers) and connections for input and output. If the input is low voltage and the output a higher, then you can say engineering science is a Appreciation transformer. If the input is high and the output is low, then you can say it is a STEP-DOWN. This type of transformer can not by used where safety is a large factor.