Ratings & What They Mean for Fit
The 3RT6016-1BG42: The AC-3 motor-switching rating of 4 kW at 400 V is the headline figure — it tells you the contactor can handle the inrush and breaking of a standard squirrel-cage motor up to that power. At 230 V the rating drops to 2.2 kW, and at 690 V it reaches 5.5 kW, reflecting the current-limited nature of the contactor's thermal capacity. The 750 1/h maximum switching rate under AC-3 and AC-3e is the mechanical/electrical endurance limit for motor duty; exceeding it accelerates contact wear. The DC coil at 125 V is the key differentiator from the more common AC-coil variants — verify your control voltage matches before specifying.