What this contactor is and where it fits
The ABB AF305B-30-22RT-11 is a 3-pole contactor with a dual-range coil accepting 24-60 VAC or 20-60 VDC. That wide pickup range simplifies panel wiring — one part covers both AC and DC control circuits without swapping coils. It's a standard DIN-rail mount, so it clips into the same footprint as other AF-series contactors in the enclosure.