Three power poles (3 NO), one NC auxiliary, and a 220-230 V AC coil. The AC-3 rating of 12 A at 440 V tells you it handles standard three-phase squirrel-cage motors drawing up to that current during starting and plugging, which covers small conveyors, pumps, and fan drives in a panel that needs forward-reverse without a separate reversing starter.
Sourcing Reality — Obsolete, But Available
Schneider lists this part as obsolete.
The AC-3 rating of 12 A at 440 V governs motor switching — it is the current the contactor can make and break under the inductive load of a starting motor. The AC-1 rating covers resistive loads like heaters, typically higher than the AC-3 figure, so if you are switching a purely resistive bank the contactor can carry more current. The 220-230 V AC coil is a standard control voltage in many industrial panels; verify your control transformer taps match.