3RW4427-1BC44

The SIRIUS 3RW44 series soft starter has a standard rated output of 93 amps and 45 kW at 400 volts, and an internal delta connection output of 161 amps and 90 kW. The main circuit voltage range is 200 to 460 volts, the control voltage is 230 volts, and the front panel protection rating is IP20.

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Product photo of Siemens 3RW4427-1BC44 SIRIUS soft starter

Product Positioning

The 3RW4427-1BC44 belongs to the Siemens SIRIUS 3RW44 series of medium-sized soft starters. By controlling the conduction angle of the thyristors, it smoothly adjusts the voltage at the motor terminals, reducing current surges during direct start-up. It is suitable for start-stop control of medium-sized three-phase motors such as conveyor belts and fans.

Core Product Advantages and Features

Dual connection method covers a wider range of power

The standard connection is 45 kW, and the internal delta connection is 90 kW. The same model can be adapted to different motor winding configurations.

Front panel IP20 protection

The front panel has an IP20 protection rating, reducing the risk of dust and foreign objects entering the distribution box.

Box type and screw dual terminal

The main circuit uses box-type terminals, while the control circuit uses screw terminals, balancing wiring speed and stability.

Built-in fault indicator light

The panel has fault status indicators, which makes it easy for on-site personnel to quickly determine the cause of the abnormality.

project	Specification
model	3RW4427-1BC44
Product Type	SIRIUS 3RW44 Soft Starter
Standard circuit rated current (400V/40℃)	93 A
Internal delta connection current (400V/40℃)	161 A
Standard circuit power	45 kW
Internal delta connection power	90 kW
Main circuit rated voltage range	200～460 V AC
Control power supply voltage	230 V AC, 50/60 Hz
Terminal type	Box-type terminals (main circuit) / Screw terminals (control circuit)
Enclosure protection rating	Front panel IP20
External dimensions (width × height × depth)	170×192×270 mm
Original replacement model	SIRIUS 3RW5527-1HA14

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