Siemens SIRIUS 3RW4028-1BB14 Soft Starter, 38A, 230V AC/DC, 18.5kW, 3-Phase

The Siemens SIRIUS 3RW4028-1BB14 is a compact soft starter designed for gentle starting and stopping of three-phase asynchronous motors. With a rated operational current of 38 A and a control supply voltage of 230 V AC/DC, it is ideal for standard industrial applications requiring reduced mechanical stress and controlled acceleration.

Advantages

Integrated bypass function for energy efficiency and reduced heat dissipation. Voltage ramp starting method ensures smooth motor start-up. Compact SIRIUS S0 design saves space in control cabinets. Suitable for DIN rail or screw mounting.

Suitable for

• Three-phase asynchronous motors up to 18.5 kW at 400 V
• Standard applications such as pumps, fans, compressors, and conveyors
• Industrial environments requiring gentle start/stop

Key specifications

• Product Type: Soft Starter
• Series: SIRIUS 3RW40
• Rated Operational Current (at 40°C): 38 A
• Rated Operational Voltage (Main Circuit): 200 - 480 V AC
• Control Supply Voltage: 230 V AC/DC
• Rated Power (at 400V): 18.5 kW
• Number of Phases: 3-phase
• Starting Method: Voltage Ramp
• Integrated Bypass: Yes
• Overload Protection: No (requires external device)
• Connection Type: Screw Terminals
• Ambient Temperature (Operation): -25 to +60 °C
• Mounting Type: DIN Rail / Screw Mounting
• Degree of Protection: IP00 (terminals), IP20 (enclosure)

Recommendations

For overload protection, use an external motor protection switch or circuit breaker. Ensure proper heat dissipation in the control cabinet. Compatible with Siemens SIRIUS 3RW40 series accessories.