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Siemens 3RW4056-6BB35 SIRIUS Soft Starter - 145A, 575V

Siemens 3RW4056-6BB35 SIRIUS soft starter, 145A, 575V.

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ManufacturerSiemens

Part number3RW4056-6BB35

Type SIRIUS Soft Starter

Current Rating 145 A

Power Rating 150 hp

Voltage 400-600 V AC

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12-month warranty

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Veteran-owned

CAGE: 9NK75

Smooth motor acceleration Reduced inrush current Overload protection Integrated bypass contactor (on some variants) Compact design

Product description

The Siemens 3RW4056-6BB35 is a SIRIUS soft starter rated for 145A and 150 hp at 575V. It operates on a 400-600V AC supply with 115V AC control voltage and features screw terminals. Please note this is a phased-out product, with the preferred successor being the 3RW5056-6AB15.

Soft starters like this are used to control the motor startup process, reducing mechanical stress and electrical inrush current. They find applications in pumps, fans, compressors, and conveyor systems across various industries.

Stanlo Automation, a veteran-owned surplus parts distributor, offers this component. We provide cost-effective solutions for your automation needs, ensuring you can maintain or upgrade your existing systems.

Technical specifications

Type	SIRIUS Soft Starter
Current Rating	145 A
Power Rating	150 hp
Voltage	400-600 V AC
Control Voltage	115 V AC
Terminals	Screw
Frame Size	S6
Degree of Protection	IP20

Common applications

Pumps

Fans

Compressors

Conveyor systems

Machine tools

HVAC systems

Compatible systems

Induction motors (3-phase)

Also known as

Siemens SIRIUS soft starter 3RW40 series soft starter 145A soft starter S6 soft starter

Replaces / compatible with

This is a phased-out product. The preferred successor is the Siemens 3RW5056-6AB15. Consult manufacturer documentation for detailed replacement information.

Technical note

Expert tip

While this unit is phased out, understanding its specifications can help in selecting the appropriate modern replacement from the 3RW5 series.

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Frequently asked questions

What is the successor to the Siemens 3RW4056-6BB35 soft starter?

The Siemens 3RW4056-6BB35 is a phased-out product. The preferred successor is the Siemens SIRIUS 3RW5 series, specifically the 3RW5056-6AB15.