The Siemens SIRIUS 3RT1317-1AF00 is a size S00 power contactor with four normally-open main contacts, rated for AC-2 duty at 5.5 kW on a 400 V three-phase line. That AC-2 rating covers slip-ring motor switching — the contactor sees moderate inrush and makes/breaks under load, so the 5.5 kW figure is the real-world motor capacity, not an optimistic resistive number.
The 4 NO main contacts handle up to 10 A in AC-12 duty (control-circuit loads) and switch motor loads at AC-2 up to 5.5 kW at 400 V. The S00 frame keeps the width at 45 mm and depth at 72 mm — tight for a 4-pole contactor, so it leaves room on the DIN rail for auxiliary blocks or a soft starter. Screw terminals accept solid or stranded copper: 2x 0.5…1.5 mm², 2x 0.75…2.5 mm², or max 2x 0.75…4 mm², with AWG equivalents down to 12.