3RA6120-1CB32 Siemens 1.5 kW Advanced Motor Starter, 1 – 4 A. The SIRIUS 3RA6 compact starters are a generation of innovative load feeders with the integrated functionality of a circuit breaker,contactor and solid-state overload relay. In addition, various functions of optional mountable accessories (auxiliary switches,surge suppressors) are already integrated in the SIRIUS compact starter.