Insulators are devices installed between conductors at different potential voltages or between conductors and grounded structures, capable of withstanding voltage and mechanical stress. 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 components and connecting hardware.

Insulators are special insulation controls that play a crucial role in overhead transmission lines. In earlier years, insulators were commonly used on utility poles. Over time, many disc-shaped insulators were hung at one end of tall, high-voltage transmission line towers to increase the creepage distance. Made typically from 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 impair the entire line's service and operational lifespan.