The 3RT2038-1CK64-3MA0: It carries a 65 A rating at 480 V, which means it can handle 3-phase motors up to that current in AC-3 duty — the standard motor-switching category per IEC 60947-4-1. The 55 mm width and 174 mm depth fit the standard S2 footprint on 35 mm DIN rail, so it wires up clean in a crowded enclosure without overhanging the rail.
At 480 V the contactor is rated 65 A — this is the maximum continuous current in AC-3 service, not the resistive AC-1 rating. The contactor has no auxiliary switch built in — you'll need a separate auxiliary contact block if your circuit needs a feedback signal. The main contacts are rated for 18 to 1 operations (likely 18 make/break cycles per hour).