The Siemens 3RQ4050-1SM50 is an output optocoupler relay from the SIRIUS 3RQ4 series, designed for isolating and switching DC control signals in industrial control panels. The 6.2 mm narrow housing saves DIN-rail space in dense panel layouts. The 3 A thermal current (Ith) is the continuous carry rating through the closed contact under free-air conditions. For switching inductive loads, derate per the load's inrush — the 3 A figure governs the steady-state, not the break current.
RoHS compliance is confirmed from 26 September 2024. No UL or CSA listing is stated in the available documentation.
The 6.2 mm width per unit allows high-density mounting on a standard DIN rail. Packaging dimensions of 95 x 93 x 65 mm reflect the individual unit carton. For panel fill-factor calculations, use the 6.2 mm width per relay; the depth and height are within standard enclosure clearance for DIN-rail components.