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How To Choose A Surge Protector

Electronics Forum
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Topic author United States of America
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Mon Jan 13, 2020 12:58 am

How To Choose A Surge Protector
(This is an answer to question that would be useful as a separate thread)

Not all devices need to be connected to surge protection (e.g. basic kettles) however the more sensitive of microprocessors should be connected to a surge protector of a decent rating. Note that not all surge protectors are rated equal; higher joule ratings offer better protection against larger surges. You should select a unit with at least 2000 joules for decent protection.

Over time surge protectors do fail and require replacement after voltage spikes. This is why it's important to select one with an indicator light that specifies when the internal metal oxide varistors (MOVs) fail. This occurs when they're exposed to voltages well beyond their rated values. Check surge protector indicators frequently to determine whether they're still working and if replacement is required.

Inexpensive protectors can trip long after the voltage has spiked effectively damaging the connected device(s) regardless. That's why you need reputable equipment rated with a response time of less than one nanosecond.

See this diagram from All Services


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