The AT 50 B420L from LEM is a Current Transducer with AC Input Current 50 A, Output Current 0.03 A, Supply Voltage 20 to 30 V, Accuracy 0.015, Frequency 0.05 to 0.06 kHz. Tags: Screw Mount, AC Current Transducer. More details for AT 50 B420L can be seen below.