the insulators take heat out of the electronics to stop getting hot, then store the heat. Once the electronic device is turned off, it will begin cooling off Insulators do not conduct electrons very well. And as a consequence it isolate electronics part from other parts. it is usually extensively used on heat sink to isolate the part from the metal Another reason is because its also helps protect the human body from coming in contact with a high voltage that's running through the wires.
