Insulators are devices installed between conductors at different voltages or between conductors and grounding structures, capable of withstanding voltage and mechanical stress. There are numerous types of insulators, each 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 devices that play a crucial role in overhead transmission lines. In earlier years, insulators were commonly used on utility poles. Over time, many disk-shaped insulators were hung at the end of tall, high-voltage transmission towers to increase the creepage distance. Typically made of glass or ceramic, these 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, otherwise, they would not serve their significant purpose and could damage the entire line's usability and operational lifespan.