Siemens sirius compact starter direct starter 3ra6 series siemens 3ra6120 1dp32 the siemens 3ra6120 1dp32 is a compact starter from the sirius 3ra6 range this 55kw 3 12a direct on line starter combines the functions of a power switch an electronic overload relay and a contactor in a single complete unit it can be used in applications where three phase standard motors 400v can be started directly in its compact design the 3ra6 offers significant space savings in the control panel