The ABB 1SBL237001R1100 AF26-30-00-11 is a 3-pole contactor from the AF Series, carrying a 45 A rating and a 24 V AC/DC coil. The coil accepts both AC and DC control voltage, so you don't need to spec a separate rectifier or worry about polarity on the control side.
The 45 A rating is the conventional thermal current (Ith) — the continuous current the main poles can carry in open air. For motor switching, the real number to watch is the AC-3 duty rating: this contactor is sized for an 11 kW, 690 V AC motor, which translates to roughly 30–32 A in AC-3 service. If your motor nameplate pulls more than that across the line, you need to step up to the next frame. The 24 V AC/DC coil holds in at 0.85 x nominal and drops out reliably below 0.4 x nominal, so it's stable on a 24 V control bus with typical voltage sag.