Short answer: polymer surge arresters are lighter and safer for many distribution projects, while porcelain surge arresters are used where the project standard or long-term utility practice requires porcelain housing.
| Polymer housing | Light weight, good pollution performance, safer failure behavior and easier handling. |
|---|---|
| Porcelain housing | Rigid ceramic housing, common in legacy utility specifications and some high-voltage projects. |
| Outdoor pollution | Confirm creepage distance, hydrophobicity, pollution class and altitude for both housing types. |
| Accessories | Confirm bracket, disconnector, surge counter, insulating base and line lead requirement. |
A polymer arrester can often replace porcelain only when electrical rating, creepage distance, mounting and utility approval are all matched.
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