The ABB A26-30-10-34 is a 3-pole, non-reversing contactor from the A26 series, rated for 28 A with a 208 V AC coil and one normally open auxiliary contact. The 28 A rating is the general-purpose thermal current (Ith); for motor loads, derate to the AC-3 duty current specified on the nameplate — typically around 22–24 A for this frame size. The 208 V AC coil pull-in range is about 85–110 % of rated voltage, so it holds reliably at 177 V and drops out around 60 V. The single N/O auxiliary is factory-fitted on the front; if you need more auxiliary poles, a side-mount block stacks onto the same DIN-rail footprint without re-wiring the main contacts.
The 3-pole main contacts and the 208 V AC coil terminals are clearly marked on the front face; the single N/O auxiliary sits on the left side of the contactor deck. For a motor starter, pair it with a matching overload relay from the same A26 family (e.g., TA26 series) — the overload mounts directly below the contactor without additional wiring between the power poles. The coil draws roughly 6 VA inrush and 4 VA sealed at 208 V, so a 10 VA control transformer per contactor is sufficient.