The D40R-SPU-21-M12 is an RFID-based non-contact safety interlock switch from Banner Engineering's D40R series. It uses RFID coding (individual or unique coding) to confirm guard position without physical contact, so no wear on the actuator mechanism — a real advantage on high-cycle doors or sliding guards where a mechanical switch would fatigue. Rated IP67, the polyester housing handles washdown environments; the description also notes an IP69K version exists for the series, meaning this base variant covers most food-and-bev and wet-area guarding without the full high-pressure rating. The safety contacts are 2 NC + 1 NO — two normally-closed channels for the safety circuit (category 4 / PL e capable with the right controller) and one normally-open auxiliary for status feedback to the PLC. Max switched current is 30 mA at 24 VDC, so this is a signal-level output to a safety relay or safety PLC input, not a power-switching device.
Deployment context — guarding a hazard zone
Mounts via the M12 connector — pre-wired or field-terminated, whichever gets the line running faster. The -25 to 80°C range covers most indoor plant floors and refrigerated areas; if your application sees freeze-thaw cycles, the polyester housing resists corrosion better than metal in condensation-heavy environments. The LED indicator gives immediate visual confirmation of actuator alignment — no digging into the safety controller to see if the guard is closed. On a breakdown call, that LED saves the 15 minutes of walking back to the panel.