Parece que é o conector do tipo C19 / C20
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Earthed, 16 A, polarized. This coupler is used for some IT applications where higher currents are required, as for instance, on high-power workstations and servers, uninterruptible power supplies, power distribution units, large network routers, switches, blade enclosures, and similar equipment. It is rectangular and has pins parallel to the long axis of the coupler face.