The Siemens 3RQ4038-2AE01 is a SIRIUS 3RQ4 coupling relay in the narrow 6.2 mm housing. It functions as an input coupler with an integrated relay, accepting a 115 V AC/DC control signal and switching a single change-over contact rated for 6 A thermal current. The hard gold-plated contacts suit low-level switching applications where oxidation resistance matters. Push-in spring-loaded terminals speed wiring — strip 8 mm, push the ferrule, done.
Compliance and regulatory
RoHS compliant since 26 September 2024.
The narrow profile means derating for grouping is minimal — but if you pack a dozen side-by-side at full 6 A, account for mutual heating in the enclosure design.