The Siemens 3RF3330-1AA24 is a 1-pole solid-state contactor from the SIRIUS 3RF33 family, rated for 30 A in AC-1 duty at 40 °C ambient. AC-1 covers resistive loads — heaters, ovens, lighting banks — where the current waveform is sinusoidal and inrush is minimal. The 30 A figure is the continuous current the semiconductor can carry under those conditions; for motor or transformer loads (AC-3/AC-4), derate per the manufacturer's curve.
Integration notes
Termination is via screw terminals, which suits panel builders who prefer a positive mechanical clamp over spring-cage for higher-current solid-state switching. The packaging dimensions (105 x 27 x 122 mm) indicate a slim 27 mm width — one standard modular unit on a DIN rail, so it occupies a single position in a control panel. The 1-pole configuration means it switches one phase; for three-phase resistive loads, three units are needed, or consider a 3-pole variant from the same family if panel space is tight.