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Siemens SIRIUS Soft Starter 3RW4447-2BC44

Siemens SIRIUS Soft Starter 3RW44

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ManufacturerSiemens

Part number3RW4447-2BC44

Rated Current (Standard) 432A (400V, 40°C)

Rated Current (Inside-Delta) 748A (400V, 40°C)

Supply Voltage 200-460V AC

Control Voltage 230V AC

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Veteran-owned

CAGE: 9NK75

Soft Starting & Ramp-Down Integrated Bypass Contact System Intelligent Monitoring Functions High Motor Output Capability Spring-Type Terminals

Product description

The Siemens SIRIUS 3RW4447-2BC44 is a high-performance soft starter designed for the soft starting and ramp-down of three-phase asynchronous motors. It offers impressive ratings: 432 A at 400V (standard circuit) and 748 A at 400V (inside-delta circuit). It operates on a 200-460V AC supply with 230V AC control voltage and features spring-type terminals.

This soft starter is ideal for applications requiring smooth motor acceleration, reduced current peaks, and minimized mechanical stress on machinery. It's commonly used in pumps, fans, compressors, and conveyor systems where precise motor control is essential.

Stanlo Automation, your veteran-owned surplus industrial parts provider, offers the Siemens SIRIUS 3RW4447-2BC44. Although phased out, we ensure you can still source this reliable component to maintain your existing systems. We are committed to quality and customer satisfaction.

Technical specifications

Rated Current (Standard)	432A (400V, 40°C)
Rated Current (Inside-Delta)	748A (400V, 40°C)
Supply Voltage	200-460V AC
Control Voltage	230V AC
Terminals	Spring-type
Series	SIRIUS 3RW44

Common applications

Pump Control

Fan Control

Compressor Control

Conveyor Systems

Industrial Drives

Motor Starting

Compatible systems

Compatible with three-phase asynchronous motors and control systems requiring soft-starting capabilities.

Also known as

SIRIUS 3RW44 Soft Starter Siemens Motor Soft Starter

Replaces / compatible with

This product is phased out. The preferred successor is the SIRIUS 3RW5547-2HA14. However, for existing installations, this unit provides reliable soft-start functionality.

Technical note

Expert tip

This unit is designed for high motor outputs and inside-delta circuits, featuring innovative torque control for ideal motor startup.

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Frequently asked questions

What are the main current ratings for the Siemens SIRIUS 3RW4447-2BC44 soft starter?

The Siemens SIRIUS 3RW4447-2BC44 soft starter has a standard rating of 432 A at 400V (40°C) and an inside-delta rating of 748 A at 400V (40°C).