NK Technologies's DS1 DC Current Sensors
DS1 dc current sensors have a non-adjustable one-piece design for detection of very low dc current levels. The sensors can be powered by any dc voltage of 10–28 V and use the same circuit as the one being controlled, or a separate power as long as the circuit being controlled uses the same ground. A solid-state contact closes the output when there is dc current as low as 0.75 A, and opens when there is no current. The contact can control a dc load up to 1 A/30 Vdc.