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 the structures and appearances of different types of insulators vary greatly, they are both primarily composed of insulating parts and connecting hardware.

Insulators are special insulation 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 disc-shaped insulators hanging at one end of tall, high-voltage transmission tower connections. These are designed to increase the creepage distance, typically made of glass or ceramic, and 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 serve their significant purpose and could damage the entire line's usability and operational lifespan.