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AC712 is a magnetical (hall effect) sensor and not specified for the primary conductor resistance. It's a copper bar and the initial resistance variation and temperature drift will considerable reduce the accuracy if you extend the range with a shunt.allready tested ACS712-5 , range only 5 Amp!
and internal shunt is * 1.2 milliOhm for this device
if you want extend the range of yours from 30Am to 50Amp