Insulators are devices installed between conductors at different potentials or between conductors and grounding components, capable of withstanding voltage and mechanical stress. There are numerous types of insulators with varying shapes. Although the structures and appearances of different types of insulators differ significantly, they are both primarily composed of insulating components and connecting hardware.

Insulators are specialized insulating controls 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 from 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 impair the entire line's usability and operational lifespan.