ISOLATED AC CURRENT MONITOR

This circuit uses a small AC current transformer from Magnetek to produce an isolated voltage proportional to the AC current in the primary winding.  The transformer contains a single turn primary with a low 0.001-ohm resistance.  It can easily handle 30 Amps of AC current and provides at least 500vac of isolation.  With the components shown, the output AC voltage is scaled so 1 Amp of current produces 100mv of AC voltage.

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