Hubbell's three-blade design never proved popular in the U.S. because of its incompatibility with the existing type A plug, but it was favoured in Australia over the British type D system, because it was easier for local manufacturers to make plugs with flat pins rather than round ones.
Ihe atụ nke okpukpu atọ nke Hubbell gosipụtagobeghi ihe ọfụma na US n'ihi enweghị ike na ihe dị adị ụdị A nkwụnye, mana enwere ihu ọma na Australia karịa ndị Britain ụdị D Ọ dị mfe n'ihi na ndị na-emepụta ime obodo ka m ga-eji plọg plọg kama itinye ya gburugburu.