The Siemens 3RA2125-0GA23-0BB4 is a SIRIUS non-fused motor starter in a direct-start configuration, size S0. It combines a 3RT2023-1BB40 contactor and a 3RV2011-0GA15 circuit-breaker into one assembly, with a thermal bimetallic overload relay set to CLASS 10 trip curve — meaning it protects standard induction motors during start-up by allowing up to 10 seconds of locked-rotor current before tripping. Rated for AC-3 switching up to 690 V, this starter handles motor loads in conveyors, pumps, and fans. The 3-pole main circuit uses screw terminals accepting 1–10 mm² solid or 2x (2.5–6 mm²) stranded, with AWG equivalents of 2x (16–12) or 2x (14–8).
Mount vertically only. Dimensions: 193.1 mm high, 45 mm wide, 107 mm deep. Clearance needs: 30 mm upward, 10 mm forward, 10 mm downward, 0 mm backward, 9 mm at the side. The S0 feeder size keeps the footprint compact for crowded panels.