What the 50 A AC-1 rating means for your load
The Siemens 3RF3350-1AA26 is a 1-pole solid-state contactor from the SIRIUS 3RF33 series, rated 50 A in AC-1 duty at 40 °C. AC-1 covers resistive and slightly inductive loads — heaters, ovens, lighting banks — where inrush stays under 1.5× steady current. For motor loads (AC-3 duty), the switching current must be derated; this part is sized for resistive switching, not direct motor starting. The load circuit accepts 48-600 V, and the coil is wound for 110-230 V AC, so it drops into standard European control-voltage panels without an extra transformer.