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. While 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 components that play a crucial role in overhead transmission lines. In earlier years, insulators were commonly used on utility poles. Over time, they evolved to include many disk-shaped insulators mounted at the top 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, as this would negate their significant function and compromise the entire line's usage and operational lifespan.