The main function of an isolation transformer is to electrically isolate one part of a circuit from another, while still allowing power to flow between them. This isolation helps protect sensitive equipment and devices from electrical noise, voltage spikes, and other potential hazards that can disrupt or damage the equipment. Isolation transformers also provide a safer working environment by reducing the risk of electrical shock and ensuring that each circuit is operating independently. Overall, the primary purpose of an isolation transformer is to enhance safety, protect equipment, and improve the performance and reliability of electrical systems.