Square D Schneider electric SGA8180 Construction Threaded Barrel; 200 Vdc Operating Voltage; 0.5 Ampere ( An ampere is the unit used to measure electric current.) Load Current; End Sensing Position; Output Configuration (Config.) No; 18 mm (Millimeter) Barrel Diameter; Sg Model; With Built In Rc Protection . SQUARE D : SENSORS, PROXIMITY, U S