Key rating — what it means
The ZA110-34: Rated 208/60 — this is the coil operating voltage (208 V at 60 Hz). For a contactor coil, that voltage must match the control circuit supplying it; a mismatch means the coil either won't pull in or will overheat. The 60 Hz designation also means it is intended for North American 60 Hz supply systems, not 50 Hz European mains.