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. 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 devices that play a crucial role in overhead transmission lines. Initially, insulators were commonly used on utility poles, and over time, many disc-shaped insulators were hung at the end of tall, high-voltage transmission line towers to increase the creepage distance. Made typically from 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, as this would render their significant role ineffective and damage the entire line's usage and operational lifespan.