Router load calculation

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MIEngineer

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Something I never really put much thought to before. I have a router that I am being asked to supply power to. The cut-sheet simply says that the unit requires 40A input, but the unit can accept an input voltage of 100-240VAC. With this being a single phase unit would it be safe to surmise that the 40A rating is with 100VAC supply?

I am planning on supplyiung the unit with 208VAC if the 40A input is at 208VAC = 8.32 kVA, then I would be required to upsize the UPS supplying this unit.

Can I assume the requirement is 40A * 100VAC = 4.0 kVA? Therefore my load at 208VAC would only be 19.23A (4.0 kVA / 208VAC)?

Thanks for any input.
 
UH, that says its for a DC supply. Are you sure the voltage is right?

8KW sounds like a lot for a router.

Steve
 
Thank you for keeping my sanity in check. The table I posted was used if you are supplying the power supply with DC. Boy was I way off, by nearly a factor of 8.

Just below what I posted in the documentation is the note "All Cisco ASR 1000 Series Router AC power supplies require a 20 AMP circuit breaker."

Thanks a million. The link was what I was looking for.
 
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