The Siemens 3RQ4038-2AF00 is a SIRIUS 3RQ4 coupling relay in the narrow 6.2 mm housing, designed as an input coupler with an integrated relay. It switches one change-over contact at 230 V AC/DC coil voltage, rated for a thermal current of 6 A.
At 6.2 mm wide, this relay snaps onto a standard DIN rail (EN 60715) and packs densely — roughly 16 units per 100 mm of rail. The narrow profile matters when you're squeezing signal isolation into a crowded gland plate or a pre-populated sub-panel. Push-in terminals keep wiring time down: no ferrule crimping for solid wire, and the release tool (a 2.5 mm screwdriver) clears the cage in one push.
RoHS compliant since 26 September 2024.