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Siemens 3RW4028-2BB04 SIRIUS Soft Starter S0

Siemens SIRIUS soft starter S0 with 38A rating and 200-480V AC input.

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ManufacturerSiemens

Part number3RW4028-2BB04

Size S0

Rated operational current 38 A

Rated power at 400V 18.5 kW

Control supply voltage 200-480 V AC

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SIRIUS 3RW40 series S0 size 38A rating 18.5kW @ 400V Spring-type terminals Wide voltage range

Product description

The Siemens 3RW4028-2BB04 is a SIRIUS soft starter, specifically an S0 size, capable of handling 38 A and 18.5 kW at 400V. It operates within a voltage range of 200-480V AC and features spring-type terminals for 24V AC/DC control power. This soft starter is designed for smooth motor acceleration and deceleration, reducing mechanical stress and power surges.

This component is ideal for applications requiring controlled motor starting, such as conveyor systems, pumps, fans, and compressors in various industrial settings. Its reliable performance ensures extended equipment life and operational efficiency in manufacturing, material handling, and building automation.

Stanlo Automation, a veteran-owned business, offers this Siemens soft starter with the assurance of quality and availability. We specialize in surplus industrial automation parts, providing cost-effective solutions for your MRO needs.

Technical specifications

Size	S0
Rated operational current	38 A
Rated power at 400V	18.5 kW
Control supply voltage	200-480 V AC
Auxiliary voltage	24 V AC/DC
Terminal type	Spring-type terminals

Common applications

Motor starting

Pump control

Fan control

Conveyor systems

Compressor control

Industrial machinery

Compatible systems

SIRIUS motor starters SIRIUS overload relays SIRIUS control units

Also known as

Siemens SIRIUS 3RW40 3RW40 soft starter

Replaces / compatible with

Replaces older Siemens soft starters in the same S0 frame size. Compatible with SIRIUS control components.

Technical note

Expert tip

Ensure proper heat dissipation as the rating is specified at 40°C ambient temperature; derating may be required for higher ambient conditions.

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Frequently asked questions

What are the key voltage specifications for the Siemens 3RW4028-2BB04 soft starter?

The Siemens 3RW4028-2BB04 operates with a main circuit control supply voltage range of 200-480V AC. The auxiliary control voltage for its terminals is 24V AC/DC.