>Is there a good reason why one should pick 12 Volt relays? We have a
>system where we have 5 Volt power and 12 Volt relays

Is that what you're wanting to use or is that what's in use ?

> Thus, for a given type of relay, the coil current will be higher by almost
> 2.5:1

So wouldn't the pull-in pulse be more likely to cause noise with a 5V
supply than a 12V (assuming they're rated at the same amperage) ?

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