3RW4447-6BC44
The Siemens SIRIUS 3RW4447-6BC44 standard circuit has a rated current of 432A and an internal delta connection of 748A. The power is 250kW at 400V and 400kW at internal delta connection. The control voltage is 230V AC. It has built-in bypass contacts and overload protection and is suitable for reduced-voltage starting of heavy-duty motors such as large pumps and fans.
Product Positioning
The 3RW4447-6BC44 is the highest current rating complete soft starter in the SIRIUS 3RW44 series. It uses thyristors to control the voltage to gradually increase and decrease, which greatly reduces the inrush current and mechanical shock when starting large motors.
Core Product Advantages and Features
High current carrying capacity
The standard circuit has a rated current of 432A, which can be increased to 748A with the internal delta connection method, meeting the starting requirements of large motors.
Built-in bypass contact system
After startup, it automatically switches to bypass contact operation, reducing thyristor heating and extending service life.
Thermal resistance motor protection
It integrates thermal resistance evaluation functions to monitor motor temperature in real time and prevent overheating and burnout.
Flexible wiring design
It supports both standard and internal delta wiring methods, allowing you to select the most suitable starting configuration based on your motor specifications.
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3RW4447-6BC45
The 3RW4447-6BC45 is a SIRIUS 3RW44 series soft starter. It has a 500V standard wiring rated capacity of 432A and 315kW, a control voltage of 230V AC, and an operating voltage range of 400 to 600V. It adopts a row-type main circuit and is suitable for soft starting applications of medium-sized three-phase motors.
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3RW4446-6BC44
The Siemens SIRIUS 3RW4446-6BC44 standard circuit has a rated current of 356A and an internal delta connection of 617A. The power is 200kW under 400V and 355kW under internal delta connection. The operating voltage is 200-460V AC, and the control voltage is 230V AC. It is suitable for reduced voltage starting of heavy-duty equipment such as large conveyors and crushers.
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3RW4446-6BC34
The Siemens SIRIUS 3RW4446-6BC34 is the 115V control voltage version of the 6BC44. It has a standard current of 315A at 460V and 546A for internal delta circuits. The operating voltage is 200-460V AC. It has a built-in bypass contact and is suitable for standard 115V control circuits in factories.