Siemens 3RT1044-1BB44-3MA0 Industrial Contactor

Siemens 3RT1044-1BB44-3MA0 is a three-pole power contactor (AC-3 duty) rated to switch up to 30 kW motors at 400 V AC, with a 65 A rated load current. It uses a 24 V DC coil and provides two normally open and two normally closed auxiliary contacts (2NO/2NC) for control circuits. The unit is built in the S3 size with screw-terminal main connections and is designed for heavy-duty industrial motor control. Mechanical life is specified up to 10,000,000 switching cycles, with an operating temperature range of -25 to +80 degrees Celsius and front-side protection rated at IP20 (IP00 when used with terminal blocks). Siemens notes this model as part of the Sirius line, with the 3RT2 series listed as its successor for newer installations.