Product Overview
When uncontrolled motor starts cause mechanical stress and voltage dips, the Siemens 3RW5547-6HA14 SIRIUS soft starter provides a controlled ramp-up and ramp-down, reducing wear and energy consumption. With a rated operational current of 470 A at 40 °C and an operating voltage range of 200 to 480 V, this soft starter handles heavy-duty applications.
Key Technical Specifications
| Parameter |
Value |
| Rated operational current at 40 °C |
470 A |
| Operating voltage |
200 ... 480 V |
| Control supply voltage |
110 ... 250 V AC |
| Starting voltage range |
20 ... 100 % |
| Current limiting |
125 ... 800 % |
| Integrated bypass contact system |
Yes |
| Power loss after startup at 40 °C |
141 W |
| Communication protocols supported |
PROFINET, EtherNet/IP, Modbus RTU, Modbus TCP, PROFIBUS |
These specifications ensure precise control and efficiency, translating to lower energy bills and less downtime.
Industry Applications
The Siemens 3RW5547-6HA14 is ideal for pumps, fans, and conveyors. In a pumping system, the soft start reduces water hammer, while in a conveyor, it prevents material spillage. Its torque control (10...100 %) and pump ramp-down function optimize process flow. The integrated bypass contact system eliminates heat dissipation during steady-state operation, improving overall system efficiency.
Compatibility and Integration
This Siemens 3RW5547-6HA14 supports multiple industrial communication protocols including PROFINET (standard and high-feature), EtherNet/IP, Modbus RTU, Modbus TCP, and PROFIBUS. It can integrate seamlessly into existing automation networks. The device also features an analog output (4...20 mA or 0...10 V) and programmable digital inputs/outputs, allowing flexible connection to PLCs and SCADA systems.
Maintenance and Reliability
With an integrated bypass contact, the Siemens 3RW5547-6HA14 reduces thermal stress on electronic components. The device offers comprehensive protection: motor overload (electronic + thermistor), ground fault monitoring, and current unbalance detection. Its shock resistance of 15 g / 11 ms and vibration resistance ensure durability in harsh environments. Regular firmware updates are supported, extending the product's lifecycle.
Selection Guide and Purchasing Advice
Before purchasing the Siemens 3RW5547-6HA14, verify your motor's full-load current and voltage. This soft starter requires a control supply of 110...250 V AC. For inside-delta wiring, the operational current capacity increases to 814 A at 40 °C. Ensure proper mounting clearances (100 mm upward, 75 mm downward). At PLC Source PRO (ubest101), we stock this model and can assist with technical questions. Check the product datasheet for specific application derating.