The Siemens 3RF3320-1BA04 is a 1-pole solid-state contactor from the SIRIUS 3RF33 family, rated for AC-15 duty at 12 A at 40 °C. It switches loads on a 48-460 V supply and accepts a 24 V DC control signal for instantaneous switching. Termination is via screw terminals. The AC-15 rating means this contactor is designed for switching electromagnetic loads — contactors, solenoid valves, and similar inductive devices — where the inrush current can be several times the holding current.
The 3RF3320-1BA04 mounts on a DIN rail, fitting into a standard control panel enclosure. The 24 V DC control side is polarity-sensitive — verify the DC supply orientation before energizing. Packaging dimensions are 105.00 x 27.00 x 122.00 mm, so it occupies a single 27 mm wide module on the DIN rail. Plan for adequate ventilation around the contactor; solid-state devices dissipate heat proportional to load current.