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Siemens SIRIUS Soft Starter 3RW4455-2BC45

Siemens SIRIUS Soft Starter

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ManufacturerSiemens

Part number3RW4455-2BC45

Rated Current (Std, 40C) 693A

Rated Power (Std, 40C) 500kW @ 500V

Rated Current (Delta) 1200A

Rated Power (Delta) 800kW @ 500V

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Veteran-owned

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Controlled motor starting Reduces mechanical stress Limits inrush current 400-600V AC main supply 230V AC control voltage

Product description

The Siemens SIRIUS soft starter, part number 3RW4455-2BC45, is designed for controlled starting of three-phase motors. Under standard conditions at 500V and 40°C, it can handle 693A, providing 500kW of motor power. In an inside-delta connection, it supports 1200A and 800kW. It operates within a 400-600V AC range and features spring-type terminals for 230V AC control voltage.

This soft starter is ideal for applications requiring smooth acceleration of motor loads, reducing mechanical stress and electrical inrush currents. It finds use in conveyor systems, pumps, fans, and other machinery where soft start functionality is beneficial.

Stanlo Automation, a veteran-owned surplus parts distributor, has the Siemens 3RW4455-2BC45 available. Secure this component for your MRO needs from a reliable and experienced supplier.

Technical specifications

Rated Current (Std, 40C)	693A
Rated Power (Std, 40C)	500kW @ 500V
Rated Current (Delta)	1200A
Rated Power (Delta)	800kW @ 500V
Control Voltage	230V AC
Main Voltage	400-600V AC
Terminals	Spring-type

Common applications

Motor Control

Conveyor Systems

Pump Drives

Fan Control

Industrial Machinery

Compatible systems

Three-phase AC motors Industrial control panels Motor control centers

Also known as

SIRIUS Soft Starter Siemens Motor Starter 3RW44 Soft Starter

Replaces / compatible with

This is a phased-out product. The preferred successor is the SIRIUS 3RW5553-2HA16. It is designed as a replacement for previous generations of soft starters in its power class.

Technical note

Expert tip

Ensure the control voltage terminal block is correctly wired for 230V AC to prevent damage during initial power-up.

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Frequently asked questions

What is the successor product for the Siemens 3RW4455-2BC45 SIRIUS soft starter?

The Siemens SIRIUS soft starter 3RW4455-2BC45 is a phased-out product. The preferred successor is the SIRIUS 3RW5553-2HA16. Consult Siemens documentation for detailed transition information.