The Siemens 3RF3330-1AA04 is a 1-pole SIRIUS 3RF33 solid-state contactor rated for 30 A in AC-1 resistive duty at 40 °C ambient. That AC-1 rating means it's sized for resistive heater loads or lighting banks, not for motor starting — AC-3 or AC-4 duty would require derating. The load circuit accepts 48-460 V AC; the coil is 24 V DC, screw terminal connections.
Mounts on standard DIN rail. The 105 x 27 x 122 mm envelope fits a single-module width in a control panel — useful when you need to pack multiple contactors side by side for multi-zone heater control. Screw terminals accept ferrule or solid wire; strip length and torque follow the terminal marking on the contactor body.