SIRIUS S0 power contactor – 3RT6028-1AH00
The Siemens 3RT6028-1AH00 is a SIRIUS S0 power contactor with screw-type terminals for main and auxiliary circuits. Rated for motor loads at 60 °C ambient: 15.5 kW at 230 V, 27.5 kW at 400 V, and 47.5 kW at 690 V. The AC-3 and AC-3e maximum voltage is 690 V, covering common 400 V and 690 V line supplies without derating the voltage class.
Side-by-side mounting is permitted — zero gap between units saves rail space, though thermal derating should be checked when packing multiple contactors in an enclosure.
Switching capacity and coil data
Maximum switching rates: 5 000 1/h at AC, 1 000 1/h at AC-1, 750 1/h at AC-3 and AC-3e, and 250 1/h at AC-4. The AC-4 rate matters for plugging or inching duty — if your application reverses or jogs the motor frequently, stay under 250 operations per hour. Coil draws 6 A at 24 V rated value, 10 A at 230 V, and lower currents at higher control voltages (1 A at 110 V, 0.3 A at 220 V, 3 A at 400 V, 1 A at 690 V). The coil power supply must be sized for the inrush; a 24 VDC supply feeding multiple contactors should account for the 6 A per device at pickup.