Featuring tamperproof design, SMA Series provides contactless safety monitoring of machine doors. Integrated LED technology gives machine operators immediate indication of safety door's interlock status to minimize incidence of unscheduled downtime. Rated for 48 Vdc/0.2 A, interlock switches feature NO/NO/NC contacts with actuating distance of 7–20 mm. SMA 0249 models are designed with M12 connector, while SMA 0243 devices have 3 m open-wire cable integral to unit.