The Siemens 3RF3150-1AA04 is a 1-pole SIRIUS 3RF31 solid-state relay in the 22.5 mm wide housing, rated for 50 A continuous load current across a 48-460 VAC supply, switched by a 24 VDC control input. Screw terminals on both power and control sides. For motor or inductive loads, derate per the manufacturer's curve — the 50 A figure is the thermal limit, not the switching limit for every load type.
The 48-460 VAC range covers common single-phase line voltages (120, 208, 240, 277, 400, 480 VAC) without needing a different relay for each.