The Siemens 3RQ4118-2AM01 is an output coupler relay from the SIRIUS 3RQ4 family, designed as a narrow-format interface between a 24 V DC control signal and a load circuit. It carries a plug-in relay with one change-over contact rated for a thermal current of 6 A, with hard gold-plated contacts that suit low-level switching where oxide film on standard contacts can cause intermittent opens. The 6.2 mm width is the key panel-space constraint — it packs into a high-density DIN-rail row where every millimeter of enclosure fill factor matters.
RoHS compliance is confirmed effective 26 September 2024.
Integration notes
The 6.2 mm width leaves room for adjacent terminal blocks or other narrow modules — plan your gland-plate layout around the total rail fill. The push-in terminals accept 0.2–2.5 mm² conductors; strip length for the spring cage is typically 8–10 mm. The plug-in relay can be replaced without removing the base wiring — useful for field-service swap-outs where downtime is the metric that matters.