The Siemens 3RF3350-3AA26 is a 1-pole solid-state contactor from the SIRIUS 3RF33 family, rated for AC-1 resistive loads at 50 A at 40 °C. The switching voltage range spans 48-600 V, and the control coil accepts 110-230 V AC. Connection is via ring cable lugs, which means the installer provides the crimp terminal — no screw-clamp or spring-cage on the power side.
For motor or inductive loads (AC-3, AC-4), the allowable current is lower — this part is sized for resistive heater banks, lighting, or transformer primary switching where inrush is modest. The 48-600 V operating range covers common low-voltage three-phase systems (208, 400, 480, 600 V) and single-phase up to 600 V. The 110-230 V AC coil is a standard control voltage in European and North American panels; verify your control transformer taps before wiring.