The HDT-20E4/A1 from Yuanxing Electronics is a Current Transducer with DC Input Current -12 to 20 A, Output Current 0.004 to 0.02 A, Supply Voltage -12 to 12 V, Accuracy 0.01, Temperature Operating Range -25 to 85 Degree C. Tags: Panel Mount, DC Current Transducer. More details for HDT-20E4/A1 can be seen below.