The DQ640ID-B from Danisense is a Current Transducer with Output Current -1 to 1 A, Supply Voltage 14.25 to 15.75 V, Frequency 31.25 kHz, Temperature Operating Range 0 to 55 Degree C. Tags: Screw Mount, AC Current Transducer, DC Current Transducer. More details for DQ640ID-B can be seen below.