what is the advantage of isolation transformer over auto transformer?

The primary advantage of an isolation transformer over an autotransformer is electrical isolation. An isolation transformer provides galvanic separation between the primary and secondary windings, enhancing safety by preventing direct electrical contact. This reduces the risk of electric shock and protects sensitive equipment from voltage spikes. Additionally, isolation transformers can help eliminate ground loops and improve signal integrity, making them ideal for sensitive applications, whereas autotransformers are more compact and efficient but lack this isolation feature.