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Siemens 3RW4028-1BB04 SIRIUS Soft Starter - 38A, 18.5kW

Siemens 3RW4028-1BB04 SIRIUS soft starter.

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ManufacturerSiemens

Part number3RW4028-1BB04

Type Soft Starter

Manufacturer Siemens

Series SIRIUS 3RW40

Size S0

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Controlled motor start Reduced inrush current Overload protection Compact design Energy saving Easy wiring

Product description

The Siemens 3RW4028-1BB04 is a SIRIUS soft starter, size S0, rated for 38A and 18.5kW at 400V. It operates with a voltage range of 200-480V AC and a control voltage of 24V AC/DC, featuring screw terminals for connection. This soft starter is designed for smooth and controlled starting of three-phase motors, reducing mechanical stress and electrical inrush current.

Ideal for applications requiring gentle motor acceleration such as conveyor systems, pumps, fans, and compressors, this soft starter is suitable for various industrial environments. Its robust design ensures reliable operation in demanding conditions.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3RW4028-1BB04. We provide quality surplus industrial automation components, ensuring you get reliable parts at competitive prices, backed by expert support.

Technical specifications

Type	Soft Starter
Manufacturer	Siemens
Series	SIRIUS 3RW40
Size	S0
Rated operational current	38 A
Rated power at 400V	18.5 kW
Control voltage	200-480 V AC, 24 V AC/DC
Connection type	Screw terminals
Ambient temperature	40 °C

Common applications

Conveyor systems

Pumps

Fans

Compressors

Material handling

General motor control

Compatible systems

Siemens S7 PLCs Industrial control panels Motor control circuits

Also known as

Siemens 3RW40 soft starter SIRIUS 3RW4028 3RW40281BB04

Replaces / compatible with

This soft starter is designed to provide a controlled start for motors, replacing direct-on-line starters for applications requiring reduced mechanical and electrical stress.

Technical note

Expert tip

Ensure the ambient temperature does not exceed 40°C to maintain the rated operational current of 38A for the 3RW4028-1BB04.

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Frequently asked questions

What is the maximum motor power for the Siemens 3RW4028-1BB04 at 400V?

The Siemens 3RW4028-1BB04 soft starter is rated for a maximum motor power of 18.5 kW at a 400V supply. It is designed for smooth acceleration and protection of motors within this power range.