Separate the power circuit from the control circuit
The 230 V AC, 50/60 Hz specification belongs to the A1/A2 control circuit. The 3 kW at 400 V motor-switching rating belongs to the main contacts under AC-3/AC-3e conditions. Select the motor load by its voltage, current and switching duty, then check that the control source can supply the coil.
Include overload and short-circuit protection
A contactor performs the switching function. Select overload and short-circuit protective devices for the complete feeder. The data sheet distinguishes coordination types and fuse arrangements; an individual contactor listing does not establish a tested combination with an arbitrary breaker or overload relay.
Check the actual terminal arrangement and footprint
This version uses spring-loaded terminal connections and measures 45 mm wide × 70 mm high × 73 mm deep. These are the contactor dimensions, not the carton size. Leave the specified clearance for live or grounded parts and allow for conductors and any added auxiliary block.