Is it surge protected against mains spikes?

Apple 12W USB Power Adapter

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  • I don't know for sure about this particular unit, but typically power supplies don't have meaningful surge suppression built-in. I always use an external surge suppressor.

    For what it's worth, most surge suppressors become less effective over time, as the process of clamping spikes erodes the metal oxide varistors (MOV) most frequently employed by the devices.† So you can see that it doesn't make much since to incorporate surge suppression into power supplies (as they'd lose the ability to suppress surges eventually anyhow).

    This article has a fairly accurate information about surge suppressors (you'll have to build you own URI, however, cause this site doesn't allow me to enter a functioning URI; remove the space before the first slash): /212375/why-and-when-you-need-to-replace-your-surge-protector/

    † MOVs aren't the only technology used to clamp power surges, but they are compact and economical, which is why they're most often used. Larger, bulkier, heavier, more expensive components often have longer lifespans than MOVs, but they all have limited lifespans.

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