SIRIUS soft starter S0 38 A-3RW4028-1BB14

Product Description

SIRIUS Soft Starter S0 38 A – 3RW4028-1BB14

The Siemens 3RW4028-1BB14 is a high-performance SIRIUS soft starter from the 3RW40 series, designed for smooth starting and stopping of three-phase induction motors up to 18.5 kW (400 V). It reduces inrush current, mechanical stress, and voltage dips, ensuring reliable and efficient motor operation in industrial applications.

This model belongs to the S0 frame size, making it suitable for compact panel installations. It is widely used in pumps, fans, compressors, conveyors, HVAC systems, and general industrial machinery, where controlled acceleration and deceleration improves system life and operational stability.

🔹 Key Features

• Siemens SIRIUS 3RW40 series soft starter
• Part Number: 3RW4028-1BB14
• Frame size: S0
• Rated current: 38 A
• Motor power: Up to 18.5 kW at 400 V
• Supply voltage: 200–480 V AC, 3-phase
• Control voltage: 110–230 V AC/DC
• Soft start and soft stop for smooth motor control
• Integrated bypass contact system for reduced heat loss after start-up
• Thyristor-based phase control for controlled acceleration
• Adjustable current limiting and ramp time settings
• Built-in motor protection and diagnostics support
• Compact modular design for easy panel installation
• Screw terminal connections for secure wiring
• Complies with IEC 60947-4-2 standards