Devices capable of withstanding voltage and mechanical stress between conductors installed at different potentials or between conductors and grounding components. There is a wide variety of insulators, each with different shapes. Although the structures and appearances of different types of insulators vary significantly, they are both primarily composed of insulating parts and connecting hardware.

Insulators are specialized insulation components that play a crucial role in overhead transmission lines. In earlier years, insulators were commonly used on utility poles, gradually evolving to include numerous disk-shaped insulating bodies at one end of tall, high-voltage transmission line towers. These are designed to increase the creepage distance. Typically made of glass or ceramic, they are referred to as insulators. Insulators must 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.