Siemens 3RA1125-1CA23-1BB4 Combination Starter

Siemens 3RA1125-1CA23-1BB4 Combination Starter is a Sirius-series motor starter that integrates a contactor with overload protection in a single compact unit, designed to simplify motor control in electrical panels and to save valuable space in control cabinets. This combination device enables reliable motor start-up and protection for small to medium motors, suitable for applications such as water pumps, HVAC fans, material-handling conveyors, and machine tools, while reducing wiring complexity, minimizing panel depth, and speeding commissioning. The 3RA1125-1CA23-1BB4 variant belongs to the broader Sirius 3RA family, offering built-in overload relay and a compatible accessory ecosystem that supports safe, automatic protection and serviceability in standard control circuits. For exact electrical ratings, coil configuration, accessory compatibility, and installation instructions, refer to the official Siemens datasheet for this model to ensure correct coil type, current rating, and wiring topology.