To understand the Isolation Transformer, you must know what is a transformer. A transformer is a device that converts one voltage to another. There are different types of transformers.
Some transformers have single coil with various fixed or movable tappings. These are non-isolated transfomers. They are generally called variac or auto-transformer.
Such non-isolated transformers are becoming rare these days. They are generally used within other electrical equipment like voltage regulators or voltage stabilizers.
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