The Siemens 3RQ4118-1AE01 is an output coupler with a plug-in relay from the SIRIUS 3RQ4 series, designed for narrow control-panel integration. It switches a single change-over contact at 115 V AC/DC coil voltage, rated for a thermal current of 6 A. The hard gold-plated contacts suit low-level switching applications where oxidation resistance matters — think PLC outputs driving small signal loads or pilot devices. The narrow footprint means you can pack more isolation points per meter of rail compared to a standard-width interface relay.
RoHS compliance is confirmed effective 26 September 2024, with a REACH Article 33 notification for lead content above 0.1% (CAS 7439-92-1) in the candidate list. No UL or CSA specific listing is in the evidence, but the export control classification is EAR99, meaning no special licensing for most destinations.
The 115 V AC/DC coil voltage covers both common control voltages in a single variant — no need to pick AC or DC coil separately. The 6 A thermal current (Ith) is the continuous carry rating through the contacts; for motor or inductive loads, derate per the switching curve. Hard gold-plating on the contacts means this relay is specified for dry circuits or low-energy signals where standard silver alloy would tarnish and fail to conduct.