The ABB AF305-30-00-13 is a 3-pole electrical contactor rated for 312 A, part of the AF contactor family. This is the part you source when the BOM line calls for a 312 A 3-pole contactor and the panel layout expects the AF305 form factor.
Rating Context
Rated 312 A, this contactor is sized for motor loads in that current class — think large pumps, compressors, or heavy conveyor drives on 400 V three-phase systems. The AF series uses an electronic coil interface that provides wide pickup and dropout voltage ranges, reducing coil burnout risk on weak supplies.