Siemens 3RW4447-2BC45 SIRIUS Soft Starter - Phased Out

Siemens SIRIUS soft starter, 432A at 500V, phased out.

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ManufacturerSiemens

Part number3RW4447-2BC45

Standard Current (500V) 432 A

Inside-Delta Current (500V) 748 A

Standard Power (500V) 315 kW

Inside-Delta Power (500V) 500 kW

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Veteran-owned

CAGE: 9NK75

Smooth motor start-up Reduces inrush current Protects mechanical components Spring-type terminals for control High current handling capacity

Product description

The Siemens 3RW4447-2BC45 is a SIRIUS soft starter with standard operating values of 432 A at 500 V (315 kW) and inside-delta values of 748 A (500 kW). It operates on 400-600 V AC for the main circuit and features 230 V AC spring-type terminals for control. Please note that this product is phased out, and its preferred successor is the SIRIUS 3RW5547-2HA16.

Soft starters like this are used to gradually accelerate electric motors, reducing mechanical stress and electrical inrush currents. This makes them essential in applications such as conveyors, pumps, fans, and compressors where smooth starting is required to protect equipment and the power supply.

Stanlo Automation, a veteran-owned distributor of surplus industrial parts, understands the need for both current and legacy components. While the 3RW4447-2BC45 is phased out, we can help you source successors or related components. Contact us for your Siemens soft starter needs.

Technical specifications

Standard Current (500V)	432 A
Inside-Delta Current (500V)	748 A
Standard Power (500V)	315 kW
Inside-Delta Power (500V)	500 kW
Control Voltage	230 V AC
Main Voltage	400-600 V AC
Product Status	Phased Out

Common applications

Conveyor systems

Pump controls

Fan drives

Compressors

Material handling

Industrial machinery

Compatible systems

AC induction motors Control systems requiring soft motor starting

Also known as

Siemens SIRIUS 432A soft starter 3RW44 soft starter series

Replaces / compatible with

This is a phased-out product. The preferred successor is the Siemens SIRIUS 3RW5547-2HA16.

Technical note

Expert tip

When replacing the phased-out Siemens 3RW4447-2BC45, ensure the new 3RW5547-2HA16 is correctly wired and programmed to match the original motor and application requirements.

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Frequently asked questions

What is the successor to the Siemens 3RW4447-2BC45 soft starter?

The Siemens 3RW4447-2BC45 SIRIUS soft starter is a phased-out product. The preferred successor recommended by Siemens is the SIRIUS 3RW5547-2HA16.