The Omron D4C1603 is a metallic-body limit switch from the D4C series, built for position sensing in industrial automation. Its SPDT contact form with momentary action means the contacts return to their unactuated state the instant the plunger is released — standard for interlock and end-of-travel detection where the switch must not latch. The cross roller plunger actuator (stainless steel roller, 0.47 in diameter, 0.17 in width) provides a rolling contact with the cam or dog, reducing wear on repeated actuation cycles compared to a plain plunger. Rated for 5 A at 250 V AC and 4 A at 30 V DC, this switch handles typical control-circuit loads — pilot relays, contactor coils, PLC inputs — without needing an interposing relay for most applications. The IP67 rating (dust-tight and protected against temporary immersion) means it can be mounted in washdown zones, outdoors under cover, or on conveyor lines where coolant mist is present. NEMA enclosure ratings of 3, 4, and 13 confirm suitability for rain, splash, and oil-spray environments.
Surface-mount with two mounting holes (M3 or #4 screws typical). Body dimensions: 2.13 in height, 1.33 in width, 0.62 in depth — compact enough for tight rail or bracket mounting. The 9.8 ft SJT(O) cable exits the body, so plan a cable gland or strain relief at the panel entry point. Pretravel is 0.07 in, differential travel 0.01 in, total travel 0.19 in, and overtravel 0.12 in — these numbers define the cam profile needed for reliable actuation without over-stressing the plunger. Operating force is 11.77 N maximum, so the cam or dog must deliver at least that force through the full travel.