The ABB ZA185-29 is an A185-series contactor coil, identified on the nameplate as A185 COIL,140/60,120/5. This is the replacement coil for the A185 frame contactor — the one you swap when the old coil opens or the contactor sits dead on the rail.
The coil mounts directly onto the ABB A185 contactor frame. The 140/60 and 120/5 markings on the label correspond to the coil voltage and frequency ratings — 140 V at 60 Hz and 120 V at 50 Hz — so it drops into a panel wired for those control voltages without rewiring the contactor base.