The Omron D4GS-N1R-3 is a slim-profile safety door switch — the kind you mount on a machine guard interlock where panel space is tight. It carries one NC and one NO contact pair, slow-action, so the NC channel drops out before the NO makes on insertion, which is the standard safety-circuit wiring for a monitored guard. The 3 m cable is factory-molded, no connector to lose or mis-wire. Rated for 60 N minimum direct opening force, meaning the NC contact is mechanically forced open when the guard is opened — that's the positive-opening mechanism required by IEC 60947-5-1 for a safety position switch. If the actuator is withdrawn, the NC contact is guaranteed to break even if the contacts are welded.
Horizontal key insertion (the R in the order code) means the actuator enters from the side, not the top — useful on sliding or hinged guards where the actuator path is horizontal relative to the switch body. The slim housing fits where a standard 30 mm switch won't, like on extruded aluminum framing or between door hinges. Rated for 30 operations per minute maximum — that's about one cycle every two seconds. Fine for a guard door opened at shift change or for jam clearing; not for a high-cycle indexing door. The minimum applicable load is 4 mA at 24 VDC, so it will switch a standard safety relay or PLC input without needing a wetting current shunt.