Siemens 3RW3027-1BB14 SIRIUS Soft Starter S0 32A 15kW/400V 200-480V

The Siemens 3RW3027-1BB14 is a SIRIUS soft starter in frame size S0, rated at 32 A and 15 kW at 400 V / 40°C. It controls three-phase motor starting through thyristors with an integrated bypass contact system, accepting an operating voltage of 200-480 V AC and a control supply of 110-230 V AC/DC via screw terminals.

Technical specifications:

• MLFB: 3RW3027-1BB14
• Manufacturer: Siemens
• Product line: SIRIUS
• Product type: Soft starter
• Frame size: S0
• Rated current at 40°C: 32 A / at 50°C: 29 A / at 60°C: 26 A
• Rated power at 400 V / 40°C: 15 kW; at 230 V / 40°C: 7.5 kW
• Operating voltage: 200-480 V AC (-15% / +10%)
• Control supply voltage: 110-230 V AC (50/60 Hz) / 110-230 V DC (-15% / +10%)
• Insulation voltage: 600 V
• Thyristor blocking voltage: max. 1600 V
• Number of poles (main circuit): 3
• Auxiliary contacts: 1 NO contact
• Continuous operating current at 40°C: 115% of Ie
• Power loss at 40°C (typical): 13 W
• Minimum load: 10%
• Operating frequency: 50-60 Hz
• IP rating (front): IP20, finger-safe
• Degree of pollution: 3 (IEC 60947-4-2)
• Operating temperature: -25 to +60°C
• Storage temperature: -40 to +80°C
• Derating temperature: 40°C
• Installation altitude: up to 5000 m
• Mounting: screw and snap-on
• Dimensions (W x H x D): 45 x 125 x 150 mm
• Terminal type: screw terminals (main and auxiliary/control circuits)
• Max. wire length: 300 m

Features and benefits:

• Integrated bypass contact system reduces heat dissipation during continuous operation
• Thyristor-based power electronics enable controlled, stepless motor starting
• Wide operating voltage range (200-480 V AC) covers international supply networks
• Control supply accepts both AC and DC (110-230 V), simplifying panel design
• Snap-on and screw mounting options for flexible DIN rail or panel installation
• Finger-safe IP20 front face reduces risk during commissioning and maintenance

Applications:

• Soft starting of 3-phase induction motors in industrial machinery
• Pump and fan drives requiring smooth acceleration to reduce water hammer and mechanical stress
• Conveyor systems needing controlled ramp-up to protect belts and gearboxes
• Compressor starting in refrigeration and HVAC systems
• Motor starting where limited supply capacity requires reduced inrush current

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

Also known as: Siemens 3RW3027-1BB14, SIRIUS soft starter S0 32A, Siemens 3RW3 soft starter 15kW.