The Siemens 3RF3320-1BA22 is a 1-pole solid-state contactor from the SIRIUS 3RF33 family, rated for AC-15 duty at 12 A at 40 °C ambient. AC-15 is the switching category for electromagnetic loads — solenoids, contactor coils, clutches — where the inrush can be several times the holding current. The 12 A rating means it handles the steady-state current of those loads, not motor starting current. The control circuit accepts 24-230 V AC or 110-230 V AC, with instantaneous switching (no zero-crossing delay), so it fires on the first half-cycle after the control signal arrives.
This is a DIN-rail mounted solid-state contactor, sized for control cabinets where you need silent, wear-free switching of AC coils or small transformer loads. The screw terminals accept standard ferruled wiring, and the 1-pole form factor means it switches one phase — common for single-phase control circuits or as a pilot device driving larger contactors. The SIRIUS 3RF33 series sits between the compact 3RF32 and the higher-current 3RF34 frames, so this is the mid-range option for 12 A AC-15 applications.
Compliance documentation
RoHS compliant since 15-Jan-2024. This is typical for electronic assemblies with solder joints; the declaration is available for downstream users who need to pass it along under REACH.