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Siemens SIRIUS 3RW40 Soft Starter, S0 Size, 38A

Siemens SIRIUS 3RW4028-2TB04 soft starter, S0 size, 38A.

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ManufacturerSiemens

Part number3RW4028-2TB04

Series SIRIUS 3RW40

Size S0

Rated Operational Current 38 A

Max Motor Power 18.5 kW (at 400V)

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Veteran-owned

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Smooth Motor Starting Reduced Inrush Current Integrated Thermistor Motor Protection Spring-Type Terminals S0 Frame Size 24V AC/DC Control

Product description

The Siemens SIRIUS 3RW4028-2TB04 is a size S0 soft starter designed for smooth starting of three-phase motors. It has a rated operational current of 38 A and is suitable for motor ratings up to 18.5 kW at 400 V. The control voltage range is 200-480 V AC, with a 24 V AC/DC control input.

This soft starter is used to reduce the mechanical stress on machines and systems during startup by limiting the inrush current and torque. It's widely applied in pump systems, conveyor belts, compressors, and fans where smooth acceleration is required.

Stanlo Automation, your veteran-owned surplus parts distributor, offers the Siemens SIRIUS 3RW4028-2TB04 soft starter, ensuring reliable motor control for your industrial applications.

Technical specifications

Series	SIRIUS 3RW40
Size	S0
Rated Operational Current	38 A
Max Motor Power	18.5 kW (at 400V)
Control Voltage	200-480 V AC
Control Supply	24 V AC/DC
Terminals	Spring-type
Protection	Thermistor motor protection

Common applications

Pump Systems

Conveyor Belts

Compressors

Fans

Extruders

Material Handling Equipment

Compatible systems

Three-phase AC motors Control circuits with 24V AC/DC supply Standard industrial power grids

Also known as

Siemens 3RW40 soft starter Siemens motor starter S0

Replaces / compatible with

Replaces direct-on-line starters and DOL contactors for smoother motor acceleration and reduced mechanical stress.

Technical note

Expert tip

The integrated thermistor motor protection requires an appropriate external thermistor relay for activation and monitoring.

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Frequently asked questions

What is the maximum motor power rating for the Siemens SIRIUS 3RW4028-2TB04 soft starter at 400V?

The Siemens SIRIUS 3RW4028-2TB04 soft starter is rated for a maximum motor power of 18.5 kW when operated at a 400V supply voltage.