3RW4434-6BC44

The SIRIUS 3RW44 series soft starters have a standard rated output of 113 amps and 55 kW at 400 volts, and an output of 196 amps and 110 kW with internal delta connection. The main circuit voltage range is 200 to 460 volts, the control voltage is 230 volts, and the screw terminals facilitate industrial wiring.

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Product photo of Siemens 3RW4434-6BC44 SIRIUS soft starter

Product Positioning

The 3RW4434-6BC44 belongs to the Siemens SIRIUS 3RW44 series of medium-sized soft starters. It uses thyristors to control the gradual rise and fall of the motor terminal voltage, suppressing the instantaneous inrush current caused by direct starting. It is commonly used in medium-sized three-phase motor applications such as windmills, pumps and conveying equipment.

Core Product Advantages and Features

Dual-connection current output

The standard connection provides 113 amps and 55 kW, while the internal delta connection provides 196 amps and 110 kW, covering a wider range of motor power within the same model.

Wide main circuit voltage range

It supports AC power from 200 to 460 volts, and the same model can be used for voltage specifications across different regions.

Bypass contact cooling design

After startup, it switches to bypass contact operation to reduce the problem of thyristor overheating during prolonged conduction.

Screw terminals secure wiring

Both the main and auxiliary circuits use screw terminals, which are suitable for maintaining wiring reliability under long-term vibration environments.

project	Specification
model	3RW4434-6BC44
Product Type	SIRIUS 3RW44 Soft Starter
Rated current of standard circuit (40℃)	113 A
Rated current of standard circuit (50℃)	100 A
Internal delta connection current (40℃)	196 A
400-volt standard circuit power	55 kW
400 volt internal delta connection power	110 kW
Main circuit rated voltage range	200～460 V AC
Control power supply voltage	230 V AC, 50/60 Hz
Terminal type	Screw-type terminal (main circuit bus)
Enclosure protection rating	IP00, IP20 can be achieved by adding a terminal cover.
External dimensions (width × height × depth)	170×200×270 mm
Original replacement model	SIRIUS 3RW5534-6HA14

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