3RW4425-1BC44

The SIRIUS 3RW44 series soft starter has a standard rated output of 57 amps and 30 kW at 400 volts, and an internal delta connection output of 99 amps and 55 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 3RW4425-1BC44 SIRIUS soft starter

Product Positioning

The 3RW4425-1BC44 is a small soft starter from the Siemens SIRIUS 3RW44 series. It reduces the current surge during the start-up of small-power three-phase motors through thyristor-based progressive voltage regulation, making it suitable for the start-stop control needs of small pumps, conveyors, and other equipment.

Core Product Advantages and Features

Small power motor precisely corresponds

The standard connection is 30 kW, and the internal delta connection is 55 kW, suitable for the selection and matching of small and medium-sized three-phase motors.

230-volt control circuit

It controls the voltage to 230 volts AC, making it compatible with common power distribution panel power supplies and allowing for more direct installation and integration.

Box-type terminals provide stable load-bearing capacity

The main circuit adopts a box-type terminal design, combined with screw-type control terminals, to balance wiring efficiency and stability.

Front panel IP20 protection rating

The front panel has IP20 protection, making it suitable for long-term installation and use in general industrial distribution box environments.

project	Specification
model	3RW4425-1BC44
Product Type	SIRIUS 3RW44 Soft Starter
Standard circuit rated current (40/50/60℃)	57 / 51 / 45 A
Internal delta connection current (40/50/60℃)	99 / 88 / 78 A
400-volt standard circuit power	30 kW
230-volt standard circuit power	15 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

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The SIRIUS 3RW44 series soft starter has a standard rated capacity of 77 amps and 37 kilowatts at 400 volts, and 50 horsepower at 460 volts and 50°C. With an internal delta connection, it can reach 75 horsepower. The control voltage is 115 volts AC, and the front panel protection rating is IP20.

3RW4424-1BC45

This soft starter uses screw-type terminals, with a standard 47A connection and a delta connection of 81A, and can handle a wide voltage range of 400 to 600V. It features a built-in bypass contact to reduce operating heat, making it suitable for smooth start-stop control of small and medium-sized three-phase motors.

3RW4424-1BC35

Standard wiring 42A, delta wiring 73A, using 115V AC control voltage, compatible with a wide voltage range of 400 to 600V and US standard 575V motor power rating, suitable for the smooth starting requirements of three-phase motors in production lines that meet both North American and European standards.