Siemens 3RT2028-1AC20 Three Phase Contactor With Auxiliary Contacts

Siemens 3RT2028-1AC20 is a three-pole Sirius power contactor designed for AC-3e motor-start duty. It provides three-phase switching at 400 V with a 38 A current rating and an 18.5 kW load rating, housed in the compact S0 size and featuring screw terminals. The coil is 24 V AC (50/60 Hz), allowing straightforward control from standard PLCs or relays. This model includes one normally open and one normally closed auxiliary contact, enabling simple feedback or interlock wiring; additional signaling options can be added with Siemens-compatible auxiliary blocks. As part of the Siemens SIRIUS 3RT family, the 3RT2028-1AC20 is well suited for motor-control tasks in industrial automation, such as pumps, conveyors, and fans, where reliable actuation of a three-phase load and status feedback are needed.