Siemens 3RW4056-6BB44 Soft Starter

Siemens 3RW4056-6BB44 SIRIUS Soft Starter

Product Description

The Siemens 3RW4056-6BB44 is a SIRIUS S6 Soft Starter designed for smooth starting and stopping of three-phase AC motors. It uses thyristor technology to reduce starting current and mechanical stress, improving motor and equipment reliability. It is suitable for standard industrial motor applications.

Technical Specifications

• Brand: Siemens
• Model: 3RW4056-6BB44
• Product Type: Soft Starter
• Series: SIRIUS S6
• Rated Operational Voltage: 200–460 V AC
• Control Voltage: 230 V AC
• Rated Current:
  • 162 A at 40°C
  • 145 A at 50°C
  • 125 A at 60°C
• Motor Power:
  • 45 kW at 230 V AC
  • 90 kW at 400 V AC
• Frequency: 50/60 Hz
• Starting Method: Thyristor controlled soft start
• Integrated bypass contact system: Yes
• Motor overload protection: Yes
• Adjustable current limitation: Yes
• Terminal Type: Screw terminals
• Mounting: Cabinet / DIN rail installation

Advantages & Features

• Reduces motor starting current and voltage shock
• Provides smooth acceleration and deceleration
• Reduces mechanical wear on motors and driven equipment
• Integrated bypass contact improves efficiency during normal operation
• Built-in motor protection functions enhance system safety
• Compact design for industrial control cabinets
• Reliable Siemens SIRIUS technology for continuous operation

Applications

• Pumps
• Fans and blowers
• Compressors
• Conveyors
• Material handling equipment
• Industrial machinery
• Production line drive systems

Notes / Precautions

• Confirm motor rated current and voltage before installation
• Ensure the soft starter rating matches the motor power requirements
• Check wiring method and phase sequence
• Provide proper ventilation inside the control cabinet
• Avoid frequent starts beyond the rated duty cycle
• Installation and commissioning should be performed by qualified technicians