The LF 310-S/SP20 from LEM is a Current Transducer with DC Input Current -500 to 500 A, Output Current 33 to 38 mA, Supply Voltage +/- 11.4 to 21 V, Accuracy 0.002, Frequency 100 kHz. Tags: Panel Mount, AC Current Transducer, DC Current Transducer. More details for LF 310-S/SP20 can be seen below.