The Omron D4B-0100N is an auxiliary safety limit switch in the D4B family, configured as a switch box without a head. It carries IP67 protection, meaning the housing and the snap-action mechanism inside are sealed against dust and temporary water immersion — suitable for washdown zones on packaging lines or machining centers where coolant spray is constant. Contact arrangement is 1NC/1NO with snap-action output, rated insulation voltage of 600 V, and an operating temperature range from -40 to 80 °C. The 1 mm/s to 0.5 m/s operating speed covers both slow door interlock applications and faster cam-actuated cycles.
IP67 means the switch body withstands hose-down cleaning and occasional submersion — relevant for food processing, washdown stations, or outdoor conveyor interlocks where moisture ingress kills standard limit switches. The 600 V insulation voltage covers 480 VAC motor circuits with margin; the 1NC/1NO contact set gives one normally-closed channel for the safety circuit and one normally-open for the PLC status input, which is the standard wiring pattern for guard-door monitoring per ISO 13849-1. The -40 to 80 °C range means it lives in cold storage freezers or hot press enclosures without derating. The snap-action output provides positive-break behavior on the NC contact — the contacts open even if the spring fails, which is the requirement for a safety-rated limit switch.