The ABB AF38-30-11-13 is a 3-pole panel-mount contactor from the AF38 series, rated for 50 A at 690 VAC. The 50 A rating is the continuous thermal current (Ith) — the current the main poles can carry without exceeding temperature rise limits in open air. For motor switching, derate to the AC-3 duty current (typically around 37 A for this frame size) because starting inrush and switching frequency add thermal stress.
Panel-mounted — screws or bolts through the baseplate into a backplate or sub-panel. No DIN rail adapter on this variant; plan for a drilled and tapped mounting surface. The 3-pole block handles three-phase loads (motors, heaters, lighting banks) with one normally-open and one normally-closed auxiliary contact built in (the 11-13 suffix).