Short answer: insulator models should be selected by line voltage, mechanical load, creepage distance, material, connection type and pollution environment.
| Porcelain suspension insulator | Used for overhead transmission and distribution lines. Confirm U70BL, U120BL, U210BL or project load class. |
|---|---|
| Glass suspension insulator | Used where utility specifications require glass discs and visible failure inspection. |
| Composite long rod insulator | Lightweight polymer insulator for lines requiring pollution performance and lower weight. |
| Strain insulator | Used for guy wire, service line or distribution strain applications. Confirm mechanical rating. |
Insulators with similar appearance can have different load class, creepage distance and fitting interface.