Siemens 3RT2045-1AK60 is a 3-pole power contactor from the SIRIUS 3RT2 family, rated for AC-3 service up to 80 A and 37 kW at 400 V. It uses a 110 V AC coil (50 Hz / 60 Hz) to switch three-phase loads and includes one normally open and one normally closed auxiliary contact. The unit features screw-terminal connections and is sized as S3 (3RT2) for compact installation. Applications include motor control and start/stop circuits for three-phase motors up to 37 kW at 400 V, with the auxiliary contact providing feedback or interlocking as needed.
