Siemens Sirius Soft starter, screw, 110 - 230VAC/DC, 106A Part number 3RW4047-1BB14

Product Overview

The Siemens 3RW4047-1BB14 is a SIRIUS soft starter, size S3, designed for smooth motor starting and stopping by reducing inrush current and mechanical stress. It supports three-phase motors up to 55 kW at 400 V and is suitable for pumps, compressors, conveyors, fans and general industrial motor applications. With integrated bypass and screw terminals, the device enables efficient installation and reliable ongoing operation in automation environments.

Key Features

• SIRIUS 3RW40 soft starter, device size S3
• For motors up to 55 kW (at 400 V, 40 °C)
• Rated operational current 106 A
• Main circuit supply voltage: 200–480 V AC
• Control supply: 110–230 V AC/DC
• Integrated bypass reduces power loss after ramp-up
• Screw terminal connection for main and control wiring
• Soft start/soft stop with adjustable ramp parameters
• Auxiliary contacts included: typically 2 NO + 1 changeover
• Suitable for industrial motor control panels and MCC installations

Technical Specifications

• Article Number: 3RW4047-1BB14
• Product Type: SIRIUS soft starter
• Device Size: S3
• Rated Operational Current: 106 A
• Motor Rating: 55 kW at 400 V (reference rating at 40 °C)
• Main Voltage Range: 200–480 V AC, 3-phase
• Control Voltage: 110–230 V AC/DC
• Connection Type: Screw terminals
• Bypass: Integrated internal bypass contact system
• Ambient Temperature: Typically up to 40 °C without derating (higher with conditions)
• Auxiliary Contacts: 2 NO + 1 CO (typical configuration)
• Typical Dimensions: Size S3 housing footprint (vertical mounting recommended)

Compliance & Standards

• Part of Siemens SIRIUS motor control portfolio
• Designed according to IEC/industrial control equipment requirements
• Suitable for cabinet integration and heavy-duty industrial operation

Applications

Ideal for three-phase motor applications requiring reduced mechanical and electrical stress during start-up. Common applications include fans, blowers, compressors, pumps, mixers, conveyors, and general machinery. Well-suited for automation panels, process systems and motor control centers.