The HAT-20E3/A1 from Yuanxing Electronics is a Current Transducer with AC Input Current -12 to 20 A, Output Current 0.004 to 0.02 A, Supply Voltage -12 to 12 V, Accuracy 0.005, Frequency 0.4 kHz. Tags: Panel Mount, AC Current Transducer. More details for HAT-20E3/A1 can be seen below.