The Siemens 3RF3320-2AA24 is a SIRIUS 3RF33 series 1-pole solid-state contactor rated for 20 A in AC-1 duty at 40 °C ambient. That AC-1 rating covers resistive loads — heaters, ovens, lighting banks — where the current waveform stays sinusoidal and inrush is minimal. Load voltage spans 48 to 460 V AC, control voltage is 110-230 V AC.
RoHS compliance effective from January 2024.
Mounts on DIN rail — the 105 x 27 x 122 mm footprint fits standard 35 mm rail. The spring-loaded terminals mean no screw-terminal torque check during commissioning; strip 8-10 mm, push in, done. Control voltage is 110-230 V AC, so it's a direct fit for panels with a 120 V or 230 V control transformer — no DC power supply needed for the coil.