The Siemens 3RF3150-3AA24 is a 1-pole solid-state relay from the SIRIUS 3RF31 family, in a 22.5 mm wide housing. It is rated for 50 A continuous load current across a 48-460 V supply range, with a 110-230 V AC control voltage. The 50 A rating is the maximum continuous current the SSR can switch in resistive or moderate inductive loads — for motor or transformer starts, derate per the load's inrush. The 22.5 mm width fits standard DIN-rail panels, but note the ring cable lug termination: this variant is designed for mounting on an external cooling surface (heatsink), not free-air convection. That means the panel builder must provide a suitable thermal path; the relay itself does not include an integrated heatsink.
Because it requires an external heatsink, plan for a mounting plate or dedicated cooling surface behind the relay — the packaging dimensions (104 x 44 x 48 mm) give clearance for the lug terminals and wiring. The ring cable lug connection suits permanent wiring in control cabinets where vibration resistance matters more than quick disconnect.
Sourcing takeaway
Active, stocked as a standard product, and specified for the BOM line. The 50 A rating and 48-460 V range cover most three-phase motor and heater loads in 400 V industrial systems. If your line needs a drop-in SSR with external heatsink capability, this is a current-production part with full compliance documentation — submit an RFQ for pricing and lead time.