The Omron D4SL-N2NFG is a safety door electromagnetic lock switch — a monitored guard-locking device for machine access points where the hazard takes time to spin down or discharge after power removal. The solenoid holds the door locked until the control circuit de-energizes it, and the mechanical release allows egress in a power-loss scenario. The built-in switch configuration is 2NC/1NO + 2NC/1NO, giving two independent safety channels (each with a normally-closed monitoring contact and a normally-open auxiliary) for redundancy in the safety circuit. The 24VDC solenoid lock draws power from a safety-rated output; the mechanical release key (resin) provides manual override without tools.
The AC-15 rating of 5A at 120V ac governs the inductive load capability on the switch contacts — this covers typical solenoid valves, contactor coils, and small motor starters controlled through the safety circuit. AC-15 is the standard utilization category for electromagnetic loads in control circuits per IEC 60947-5-1. The DC-13 rating of 22A at 125V dc is unusually high for a door switch — it indicates the contacts can break DC motor brake coils or large DC solenoid loads at that voltage. DC-13 is the category for switching electromagnets, and the 22A figure means this switch can handle DC loads that would weld a standard 5A-rated contact block. The G1/2 conduit entry (code 2) accepts standard metric conduit fittings, and the resin head (code F) is suited for environments where corrosion or washdown is a concern — though the IP rating is not stated in this listing, the resin construction typically resists moisture better than die-cast in food or chemical processing zones.