The headline rating is 21 A at 480 V in AC-3 duty (switching squirrel-cage motors), which is the rating that governs motor load selection. For resistive loads (AC-1), the contactor can switch up to 1 000 operations per hour, while AC-3 motor switching is rated at 750 operations per hour. At 230 V, it carries a 3 hp motor load.
The 21 A AC-3 rating at 480 V means this contactor can switch a 3-phase induction motor drawing up to 21 A under starting and running conditions — the standard IEC utilization category for motor starting. The AC-1 rating (resistive) is not explicitly stated as a current value, but the 1 000 cycles/hour switching frequency indicates it handles continuous resistive loads at a higher duty cycle than motor loads. Depth is 97 mm, which matters for enclosure depth selection.