# Can a surge arrester reduce third harmonics?

**URL:** <https://forumautomation.com/t/can-a-surge-arrester-reduce-third-harmonics/12302>\
**Category:** Electrical\
**Tags:** protection, electrical\
**Created:** [July 20, 2024, 9:59am UTC](https://forumautomation.com/t/can-a-surge-arrester-reduce-third-harmonics/12302 "2024-07-20T09:59:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![automation\_engineer6](https://forumautomation.com/user_avatar/forumautomation.com/automation_engineer6/32/7656_2.png) [@automation\_engineer6](https://forumautomation.com/u/automation_engineer6)\
**Post date:** [July 20, 2024, 9:59am UTC](https://forumautomation.com/t/can-a-surge-arrester-reduce-third-harmonics/12302/1 "2024-07-20T09:59:33Z")

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Can a surge arrester reduce third harmonics?

 ![image](https://cdn.forumautomation.com/original/2X/1/1ab22b5961255d15a06cb403fb63df723287c26d.jpeg)

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**Author:** ![Instrument\_Engineer](https://forumautomation.com/user_avatar/forumautomation.com/instrument_engineer/32/6734_2.png) [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Post date:** [October 2, 2024, 4:39pm UTC](https://forumautomation.com/t/can-a-surge-arrester-reduce-third-harmonics/12302/2 "2024-10-02T16:39:21Z")

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No, a **surge arrester** is not designed to reduce third harmonics. Surge arrestors are meant to protect electrical systems from transient overvoltages, like those caused by lightning strikes or switching surges. They work by diverting excess voltage to the ground, protecting equipment from damage.

**Third harmonics** , on the other hand, are a form of harmonic distortion caused by non-linear loads in the power system. To reduce third harmonics, devices like **harmonic filters** or **phase-shifting transformers** are typically used, not surge arrestors.

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