High-intent part matching
Start with the manufacturer reference.
References such as LC1D09BL, LC1K0910P7, LC1K0601P7, ASL12-30-01-81 and CJC2-1811 identify much more than the physical size of a contactor. Coil voltage and control configuration matter. Where a replacement is being considered, compare the full label and the circuit application rather than relying on appearance alone.
For equipment that is down, send the contactor label, a clear photo of the terminals and the equipment details. CtrlOn can help identify the correct stocked part or investigate an appropriate replacement.