What Is an Isolating Transformer? Safety, Uses and Selection
An isolation transformer transfers AC power through magnetic coupling between electrically separate primary and secondary windings. Its purpose is galvanic separation: there is no intended conductive connection through the windings from the source circuit to the load circuit. Many isolation transformers have a 1:1 voltage ratio, but separation and voltage conversion are independent design choices. An isolated secondary can still deliver hazardous voltage and current. The correct selection therefore depends on the intended grounding arrangement, load, insulation rating and application—not simply the word “isolation” on a label.