The Siemens 3RF3125-1AA24 is a 1-pole solid-state relay from the SIRIUS 3RF31 family, in a 22.5 mm wide housing. It switches loads up to 25 A across a 48-460 V AC supply, with a separate 110-230 V AC control voltage. The screw terminals are standard for panel wiring — no special tooling needed.
The 22.5 mm width fits standard DIN-rail enclosures — one slot in a 24-module rail leaves room for adjacent contactors or overloads. No forced-air cooling required at rated current in a 40 °C ambient, but derate above that per the thermal curve (not shown here). The screw terminals accept 0.5–4 mm² stranded wire; torque to 0.8 Nm.
RoHS compliant since 15-01-24. No UL or IEC certification numbers appear in this listing; the part is designed for IEC 60947-4-2 environments (semiconductor contactors).