3RW4427-1BC45

The SIRIUS 3RW44 high-voltage motor has a standard rated capacity of 93 amps and 55 kilowatts at 500 volts, and can reach 161 amps and 110 kilowatts with an internal delta connection. The main circuit covers 400 to 600 volts, and the control voltage is 230 volts, making it suitable for the start-stop control needs of high-voltage motors in North America.

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Product photo of Siemens 3RW4427-1BC45 SIRIUS high-voltage soft starter

Product Positioning

The 3RW4427-1BC45 is a high-voltage soft starter from the Siemens SIRIUS 3RW44 series. Its main circuit can cover a 400 to 600 volt power grid. It starts the motor by using a thyristor-based progressive voltage regulation method, reducing the current surge and mechanical stress during the start-up of high-voltage, high-horsepower equipment.

Core Product Advantages and Features

Wide voltage coverage

The main circuit supports 400 to 600 volt AC, meeting the motor starting requirements of high-voltage power distribution specifications in many countries.

Dual-connection power output

The standard connection is 55 kW, and the internal delta connection is 110 kW. The output configuration can be adjusted according to the motor winding wiring.

230-volt control circuit

The control voltage is 230 volts AC, which is highly compatible with the power supplies of common medium and large control panels.

Screw terminal industrial wiring

Both the main and auxiliary circuits use screw-type terminals, which facilitates on-site disassembly and repair by maintenance personnel.

project	Specification
model	3RW4427-1BC45
Product Type	SIRIUS 3RW44 Soft Starter
Standard circuit rated current (500V/40℃)	93 A
Internal delta connection current (500V/40℃)	161 A
Standard circuit power	55 kW
Internal delta connection power	110 kW
Main circuit rated voltage range	400～600 V AC
Control power supply voltage	230 V AC
Terminal type	Screw terminals
Original replacement model	SIRIUS 3RW5527-1HA16

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