Its AC-12 rating of 10 A tells you the maximum continuous current it can handle in a resistive or lightly inductive load — think heater banks or transformer primaries, not motor starts. For motor duty, the AC-4 rating at 400 V of 12.5 A covers plugging and inching applications where the contactor breaks full motor current; the AC-2 rating at 400 V of 5.5 kW suits slip-ring motor starting.
Coil and control
That matters for DC-supplied PLC outputs or relay drivers — no inrush spike to manage.
Wiring and protection
Main circuit terminals are screw-type, accepting 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²) solid/stranded — plenty of range for panel wiring up to 10 mm² max per conductor.