Siemens 3RW3028-1BB14 SIRIUS Soft Starter 38A 18.5kW 200-480V

The Siemens 3RW3028-1BB14 is a SIRIUS soft starter in frame size S0, designed for controlled starting of 3-phase motors up to 18.5kW at 400V. It features an integrated bypass contact system and thyristors, with a rated current of 38A at 40°C. The wide operating voltage range of 200-480V AC and 110-230V AC/DC control supply make it compatible with diverse industrial power systems.

Technical specifications:

• MLFB: 3RW3028-1BB14
• Manufacturer: Siemens
• Product line: SIRIUS
• Frame size: S0
• Rated current at 40°C: 38A; at 50°C: 34A; at 60°C: 31A
• Motor power at 400V/40°C: 18.5kW; at 230V/40°C: 11kW
• Operating voltage: 200-480V AC
• Control supply voltage: 110-230V AC/DC
• Operating frequency: 50-60Hz
• Insulation voltage: 600V
• Auxiliary contacts: 1 NO
• IP rating (front): IP20
• Operating temperature: -25...+60°C
• Power loss at 40°C: 19W typical
• Mounting: screw and snap-on
• Terminals: screw-type (main and auxiliary)
• Dimensions (WxHxD): 45 x 125 x 150mm
• Main circuit poles: 3

Features and benefits:

• Integrated bypass contact system reduces on-state power loss to 19W typical during run operation
• Thyristor-based phase control limits inrush current during motor starting
• Compact S0 frame supports both screw and snap-on DIN rail mounting for flexible panel installation
• Wide control voltage range 110-230V AC/DC eliminates the need for additional control transformers in most installations
• Rated for installation altitudes up to 5000m above sea level

Applications:

• Soft starting of 3-phase induction motors up to 18.5kW at 400V
• Pump and fan drives requiring reduced mechanical starting stress
• Conveyor and compressor applications in industrial control panels
• Installations subject to elevated ambient temperatures up to 60°C

Compliant with IEC 60947-4-2. Part of the Siemens SIRIUS range.

Also known as: Siemens 3RW3028-1BB14, SIRIUS soft starter 38A 18.5kW, Siemens 3RW3028 soft starter S0.