Devices capable of withstanding voltage and mechanical stress between conductors installed at different potentials or between conductors and grounding components. There are numerous types of insulators, each with varying shapes. While the structures and shapes 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, and over time, many disk-shaped insulators were hung at the ends 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.