Its AC-3 rating of 22 kW at 500 V means it handles the inrush and running current of a standard three-phase induction motor at that power level — the rating that actually governs the motor starter selection. AC-2 at 400 V is 18.5 kW, for slip-ring motor applications.
The 55 mm width and 112 mm height fit standard enclosure cutouts. Side-by-side mounting is allowed — no derating gap required — so you can pack a row of these in a motor control center.
Terminal wiring
Solid wire accepts 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²). Stranded wire takes 2x (0.75 to 25 mm²). At 40 °C the minimum permissible conductor is 16 mm² — that's the thermal limit for continuous current, not the mechanical grip.
Sourcing takeaway
This is a current-production Siemens SIRIUS contactor. No obsolescence risk. If you're filling a BOM line for a motor starter, the AC-3 22 kW at 500 V is the spec to match against your motor nameplate.