Siemens Sirius Soft starter S0, screw, 24VAC/DC,12.5A Part number 3RW4024-1BB04

Product Overview

The Siemens 3RW4024-1BB04 is a soft-starter from the SIRIUS 3RW40 series (device size S0). It is designed for smooth, controlled starting of three-phase AC motors — reducing inrush current and mechanical stress during start-up, improving motor lifetime, and easing load on electrical installation. The unit supports small-to-medium motors, making it suitable for pumps, fans, conveyors and general-purpose industrial loads where gentle motor start-up is desired.

Key Features

• SIRIUS 3RW40 soft-starter, size S0
• Rated operational current: 12.5 A (at 40 °C)
• Rated motor power (400 V): up to 5.5 kW
• Main supply voltage range: 200–480 V AC, 3-phase
• Control supply voltage: 24 V AC/DC
• Integrated bypass contact system — reduces heat losses after start-up
• Thyristor-based starting control with adjustable current limitation
• Screw-terminal connections for main and control wiring
• Provides motor overload protection and intrinsic device protection

Technical Specifications

• Article Number: 3RW4024-1BB04
• Product Type: Soft-starter, SIRIUS 3RW40, size S0
• Operational Current (Ie at 40 °C): 12.5 A
• Motor Output Power (400 V): 5.5 kW
• Supply Voltage (Motor): 200–480 V AC, 3-phase
• Control Voltage: 24 V AC/DC
• Thyristor Blocking Voltage: 1,600 V
• Rated Insulation Voltage (Ui): 600 V
• Degree of Pollution: 3 (according to IEC 60947-4-2)
• Protection Class / Connection Type: Screw terminals
• Features: Integrated bypass contact, adjustable current limitation, motor overload protection
• Typical Use Case: Soft-starting three-phase motors up to ~5.5 kW, especially for smaller loads

Compliance & Standards

• Designed under SIRIUS 3RW soft-starter standard product line — ensures compatibility with industrial motor-starting norms
• Meets requirements for electrical insulation and pollution degree per IEC 60947-4-2
• Thyristor switching and bypass contact system compliant with motor-starter safety and performance standards

Applications

The 3RW4024-1BB04 soft-starter is suited for small to medium three-phase motors in industrial installations, e.g. pumps, fans, small conveyors, mixers or light machinery. It is especially useful where inrush current reduction, smooth start/stop control, and reduced mechanical stress on motor and driven equipment are desired. Installation is simple and compact, and the starter is suitable for control panels, machine-control cabinets, and retrofit motor control applications.