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Devices capable of withstanding voltage and mechanical stress between conductors at different potentials or between conductors and grounding components. Insulators come in a wide variety, with diverse shapes. Although there are significant differences in the structure and appearance of different types of insulators, they are both mainly composed of insulating parts and connecting hardware.

Insulators are specialized insulating controls that play a crucial role in overhead transmission lines. In the early years, insulators were commonly used on utility poles, gradually evolving to include many disk-shaped insulators at the ends of tall high-voltage transmission towers. These are designed to increase the creepage distance. Typically made of 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, otherwise, they would not fulfill their significant function and would harm the entire line's usability and operational lifespan.