What the 604 A rating means for fit
The ABB AF580-30-00-70 is a 3-pole contactor rated for 604 A continuous current. That figure governs the resistive load (AC-1) curve; for motor duty (AC-3) the usable current is lower and depends on the specific load and switching frequency. A 604 A frame this size typically handles motors in the 250–315 kW range on 400 V three-phase, but the exact AC-3 rating should be verified against the motor nameplate FLA and the application's switching cycles per hour.
Deployment context
This contactor is panel-mounted, typically on a backplate or DIN rail via an adapter, and used to switch motor loads (pumps, fans, compressors, conveyors) in industrial control cabinets. The 604 A rating places it in the heavy-duty range for a 3-pole block contactor, sized for main line or large motor switching where a smaller frame would not hold the thermal capacity.