Isn't ISO-500 an agricultural tractor standard? Or did you mean ISO-5000, the hot-dipped sheet steel standard?
Well, IS0-5000 might make for a higher quality case, or even a higher quality casing on the power supply, but it's what's INSIDE that power supply, eg the parts not covered by ISO-5000, that matter. And to the best of my knowledge, Chieftec makes "value" power supplies.
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