The Schneider Electric A9C21162 is a 2-pole contactor from the Acti9 iCT range, rated for motor, heating, and lighting loads on 250 V AC 50 Hz networks. It carries a 63 A rated operational current in AC-7A duty (resistive/motor loads with low inrush) and 20 A in AC-7B (motor loads with higher inrush), per IEC/EN 61095. The coil pulls 24 V AC at 50 Hz, with an inrush of 34 VA and a holding power of 1.6 W.
The AC-7A rating of 63 A is the one that governs most resistive and lightly inductive loads — think resistive heating banks or fan coils. If you are switching a motor, the 20 A AC-7B figure is the binding limit, not the 63 A headline. Electrical durability is 100,000 cycles at 63 A AC-7A, and 30,000 cycles at 20 A AC-7B — so the heavier the motor load, the shorter the contact life; plan spares accordingly.
The 2-pole footprint is 36 mm wide (2 modular pitches of 18 mm), which keeps panel density reasonable. Tightening torque is 0.8 N·m on the control circuit and 3.5 N·m on the power circuit.