I have an old AC surge protector thats roughly 20 years old, should I replace it?
MOV (metal oxide varistor) based surge protectors do not lose their capacity to divert surges with age. They can, however, go out of tolerance under extreme cases. Keep in mind that newer surge protectors, like any other product, contain the latest technology and safety features, and would easily outperform an older protector. Also, the UL1449 standards are also constantly being revised to ensure that the utmost safety is built into the surge protector.
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