Insulators are devices installed between conductors at different voltages or between conductors and grounded structures, capable of withstanding voltage and mechanical stress. There are numerous types of insulators, each with a distinct shape. While the structures and appearances of different types of insulators vary greatly, they are all composed of two main parts: the insulating component and the connecting hardware.

Insulators are specialized insulating components that play a crucial role in overhead transmission lines. In earlier years, insulators were commonly used on utility poles, gradually evolving to include many disk-shaped insulators hanging at one end of tall, high-voltage transmission towers. These are designed to increase the creepage distance. Typically made of glass or ceramic, they are referred to as insulators. Insulators should not fail due to various mechanical and electrical stresses caused by changes in environmental and electrical load conditions, as this would negate their significant function and harm the entire line's service and operational lifespan.