The Siemens 3RF3150-2AA06 is a 1-pole semiconductor relay from the SIRIUS 3RF31 family, rated for 50 A continuous through a 48-600 VAC load circuit. The 24 VDC coil uses spring-loaded terminals, and the relay is designed to be mounted on a cooling surface — that's the heatsink or panel metal it clamps to, not free-air like a contactor. At 22.5 mm wide, it fits a standard DIN-rail footprint but needs that thermal interface to shed the heat a 50 A SSR generates.
Where it goes and what it handles
This SSR handles resistive or light inductive loads in control panels — heater banks, lamp banks, solenoid valves, transformer primaries. Mounting matters with this part: it's designed to clamp to a cooling surface, so the panel builder needs to account for thermal paste or a thermal pad between the relay base and the mounting plate. Without that heat path, the 50 A rating isn't usable in continuous duty.
RoHS compliance is effective since 15-01-24, so units shipped after that date meet the EU directive.