Siemens 3RT2028-1AF00 is a SIRIUS three-pole power contactor (size S0) used for AC-3 motor control. It features three normally open main contacts rated 38 A at 400 V with an 18.5 kW motor starting capacity at 400 V, driven by a 110 V AC control coil (50 Hz). The device includes one auxiliary contact set: 1 normally open and 1 normally closed. Terminals are screw-type for secure connections.
