Siemens 3RW3047-1BB14 SIRIUS Soft Starter S3 106A 55kW 200-480V AC

The Siemens 3RW3047-1BB14 is a SIRIUS soft starter in size S3, rated at 106 A and 55 kW at 400 V / 40 °C. It provides smooth motor starting and stopping for three-phase motors via integrated bypass contact and thyristors, with a main circuit operating voltage of 200-480 V AC and control supply voltage of 110-230 V AC/DC.

Technical specifications:

• MLFB: 3RW3047-1BB14
• Manufacturer: Siemens
• Product line: SIRIUS
• Product type: Soft starter
• Size: S3
• Operational current at 40 °C: 106 A
• Operational current at 50 °C: 98 A
• Operational current at 60 °C: 90 A
• Rated power at 400 V / 40 °C: 55 kW
• Rated power at 230 V / 40 °C: 30 kW
• Operating voltage: 200-480 V AC (-15 % / +10 %)
• Control supply voltage: 110-230 V AC (50/60 Hz) or DC
• Operating frequency: 50-60 Hz
• Insulation voltage: 600 V
• Thyristor blocking voltage (max): 1600 V
• Power loss at 40 °C during operation: 21 W typical
• Minimum load: 10 %
• Integrated bypass contact: Yes
• Number of poles (main circuit): 3
• Auxiliary contacts: 1 NO
• Terminals: Screw-type (main and auxiliary/control)
• Main conductor cross-section (stranded): 4-70 mm²
• Auxiliary conductor cross-section (solid): 2x (0.5-2.5 mm²)
• IP rating (front): IP20, finger-safe
• Pollution degree: 3 (IEC 60947-4-2)
• Ambient operating temperature: -25 to +60 °C
• Storage temperature: -40 to +80 °C
• Derating temperature: 40 °C
• Installation altitude: up to 5000 m above sea level
• Mounting: Screw and snap-on, vertical surface +/-10° rotatable and tiltable
• Dimensions (WxHxD): 70 x 170 x 190 mm
• Degree of pollution: 3

Features and benefits:

• Integrated bypass contact system eliminates thyristor heat generation during continuous operation, reducing power loss to 21 W typical.
• Wide operating voltage range of 200-480 V AC covers international supply networks without additional adaptation.
• Control supply accepts both AC and DC (110-230 V), simplifying integration into existing control systems.
• Continuous operating current rated at 115 % of Ie at 40 °C allows short-term overload capacity.
• Screw and snap-on mounting with flexible tilt range of +/-10° supports fast DIN rail or panel installation.

Applications:

• Soft starting of three-phase induction motors up to 55 kW in pump and compressor systems.
• Fan and conveyor drive control requiring reduced mechanical stress at start-up.
• Industrial machinery where controlled acceleration and deceleration of motors is required.
• Motor drives in installations rated for 200-480 V AC supply, including international applications.

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

Also known as: Siemens 3RW3047-1BB14, SIRIUS 3RW30 soft starter 106A, Siemens soft starter S3 55kW.