The Siemens 3RF3150-2AA14 is a 1-pole SIRIUS 3RF31 solid-state relay in a 22.5 mm wide housing, rated for 50 A continuous load current across a 48-460 V AC supply range, with a 24 V AC/DC control input.
This SSR is designed for mounting on available cooling surfaces — meaning it needs a heatsink or a metal panel to dump its heat into. At 50 A, the junction losses add up; bolting it to a clean, flat metal surface with thermal compound is the difference between a relay that runs for years and one that cooks itself in six months. The 22.5 mm DIN-rail footprint matches standard terminal-block spacing, so it fits neatly alongside overload relays and contactors in a motor control bucket. Spring-loaded terminals: strip to 8 mm, push the wire in, done. No tool needed, which speeds up panel wiring on a build-out.
RoHS compliant since January 15, 2024. Packaging dimensions are 104 x 44 x 48 mm, single unit per package.