What this rating means for the BOM line
The 3RF3365-3AA26 is a 1-pole SIRIUS 3RF33 solid-state contactor rated 65 A in AC-1 duty at 40 °C. AC-1 covers resistive or lightly inductive loads — heaters, ovens, lighting banks — where the switching current and the steady-state current are nearly equal. That 65 A figure is the continuous current the device can carry without exceeding its thermal limit; for motor or transformer loads (AC-3 or AC-4), the rating will be lower, so match the duty class to the load. The main circuit accepts 48-600 V AC, and the coil is 110-230 V AC, so it lands directly on a standard control transformer secondary in European or North American panels.
Ring cable lug connection means the power terminations are designed for ring-type lugs — not fork or pin — so verify the lug type on the incoming and outgoing cables before terminating. The part is a 1-pole device, so for a single-phase resistive load one unit covers the switched line; for three-phase heater banks you need three units or a 3-pole variant. Mounting is DIN-rail compatible per the SIRIUS family footprint, and the compact 105 x 50 x 125 mm package leaves room alongside other control gear in the enclosure.