Devices capable of withstanding voltage and mechanical stress between conductors installed at different potentials or between conductors and grounding components. Insulators come in a wide variety, with diverse shapes. Although the structures and appearances of different types of insulators differ significantly, they are both primarily composed of insulating parts 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 insulating bodies 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 known as insulators. Insulators should not fail due to various mechanical and electrical stresses caused by changes in environmental and electrical load conditions, as their failure would render their significant function ineffective and could damage the entire line's usage and operational lifespan.