The AT 20 B10 from LEM is a Current Transducer with AC Input Current 20 A, Output Voltage 0 to 10 V, Accuracy 0.015, Frequency 0.05 to 0.06 kHz, Temperature Operating Range -20 to 60 Degree C. Tags: Screw Mount, AC Current Transducer. More details for AT 20 B10 can be seen below.