The Siemens 3RF3310-1AA26 is a 1-pole solid-state contactor from the SIRIUS 3RF33 family, rated for AC-1 resistive loads at 10 A at 40 °C. It switches across a supply range of 48-600 V and is controlled by a 110-230 V AC coil voltage, terminated via screw terminals. This class of contactor is used in control panels for switching resistive heating elements, lighting banks, or other non-inductive AC loads where silent, wear-free switching is needed — no moving contacts to pit or weld.
That 40 °C ambient is the baseline — if your panel runs hotter, you'll need to derate. The 48-600 V operating range covers common low-voltage supplies from 48 V control circuits up to 480 V and 600 V line feeds. The 110-230 V AC control voltage means it can be driven directly from a standard control transformer or PLC relay output in that range, no extra interface relay needed.