The AC-3 rating of 9 A at up to 440 V governs motor switching — that's the figure to match against your motor full-load current. The AC-1 rating of 20 A covers resistive loads like heaters or lighting contactor banks. The contactor also lists AC-3e and AC-4 utilisation categories, meaning it's tested for both normal and inching/plugging duty cycles. Coil hold-in power is 1.8 W at 20 °C, with an inrush of 1.8 W as well — a low-hold design that keeps heat dissipation down in a crowded enclosure. The control circuit voltage range is 0.7 to 1.3 times Uc for operation, with dropout at 0.1 times Uc below 50 °C. That gives a solid pick-up margin on a 24 VDC supply, even with some voltage sag. Minimum switching capability is 5 mA at 17 V for the signalling circuit — important if you're using the auxiliary contact for a PLC input or a low-power status lamp. The auxiliary contact is a single NO instantaneous type, so plan for that one feedback signal per contactor.
Power circuit connections use ring terminals with a 7 mm outer diameter, torqued to 0.8–1.3 N·m. Operating altitude is 2000 m without derating, and the ambient temperature range spans -40 to 70 °C at rated coil voltage.