Heat-shrink insulations are electronic components used to control electrical current in electrical circuits. Heat-shrink insulations, while passing electric current, limit the movement of their electronic cavity and can therefore control electric current. Heat shrink insulations play an important role in the operation of electronic devices and are available in a variety of shapes and sizes.

Heat-shrink insulations generally consist of polymer components and these components shrink under the influence of heat. Many different methods are used to control the electric current and heat shrink insulations are used in various electronic devices thanks to these methods.

Heat-shrink insulations are especially used in power supplies, signal processing devices and other devices. Heat shrink insulations can be more expensive than other electronic components, but they perform better at higher frequencies.