Omron E3K-R10K4-NR Photoelectric Switch / Sensor The E3K-R10K4 is a heavy-duty AC/DC retroreflective Photoelectric Sensor for long sensing distance. It has 950nm pulse modulated infrared LED light source and detects opaque object material. DPDT 10A relay output standard Easy to wire terminal strip Plug-in replaceable outputs Plated steel screw terminal connections