**Product Description**: Siemens Soft Starter (Model 3RW4038-1BB04) is a motor starter designed to reduce inrush current and mechanical stress during motor startup. It supports motors up to 37 kW and operates with a control voltage of 24 V AC/DC. **Technical Specifications**: - Model: 3RW4038-1BB04 - Rated Motor Power: 37 kW - Control Coil Voltage: 24 V AC/DC - Suitable for: AC motors with squirrel-cage rotor - Supply Voltage: Typically 400 V, 3-phase (line voltage) - Mounting: DIN rail or panel mounting - Integrated bypass contactor (depending on model) - Ambient Temperature: -25 to +60 °C - Standards Compliance: IEC/EN 60947-4-2 **Applications**: - Pumps, fans, compressors - Conveyors and belt systems - HVAC applications in commercial and industrial buildings - Water treatment and irrigation systems - Heavy-duty machinery needing controlled motor ramp-up