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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Siemens 3RW4446-6BC44 SIRIUS 3RW44 soft starter product image

Product Positioning

The 3RW4446-6BC44 is a high-power soft starter in the SIRIUS 3RW44 series. It uses thyristors to gradually adjust the voltage, assisting large motors to start smoothly and reducing grid impact.

Core Product Advantages and Features

High power output

The standard 400V circuit has a power output of 200kW, and the internal delta connection can further increase it to 355kW, making it suitable for large machinery.

Wide voltage compatibility

The rated operating voltage covers 200-460V AC, which can flexibly meet the power supply specifications of different factory areas.

Bypass contact saves power

After startup, it switches to bypass contact operation to reduce thyristor losses and lower operating temperature rise.

Overload protection integration

It has a built-in motor thermal resistance evaluation mechanism that can detect abnormal temperatures in real time and cut off power immediately for protection.

project	Specification
model	3RW4446-6BC44
Standard circuit rated current (400V/40°C)	356 A
Rated current of internal delta circuit	617 A
Standard circuit rated power (400V)	200 kW
Rated power of internal delta circuit (400V)	355 kW
Rated operating voltage	200-460 V AC
Control power supply voltage	230 V AC, 50/60 Hz
Protection level	IP00 (IP20 can be achieved by adding a terminal cover)
Installation method	Screw fixing
Extreme number	3P
Built-in functions	Bypass contact system, internal delta wiring capability
Applicable occasions	Heavy-duty motors for large conveyors, crushers, etc.

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3RW4445-6BC44

The Siemens SIRIUS 3RW4445-6BC44 standard circuit has a rated current of 313A and an internal delta connection of 542A. The power is 160kW at 400V and 315kW at internal delta connection. The operating voltage is 200-460V AC, and the control voltage is 230V AC. It is suitable for the reduced voltage start-up of medium and large pumps.