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Siemens SIRIUS 3RW40 Soft Starter S0, 38A

Siemens SIRIUS 3RW40 soft starter, size S0, 38A, 22kW.

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ManufacturerSiemens

Part number3RW4028-1BB05

Series SIRIUS 3RW40

Size S0

Rated Current 38 A

Max Motor Power 22 kW @ 500 V

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Smooth motor start-up Reduces mechanical shock Lowers inrush current 38A rating for S0 size 24V AC/DC control coil Screw terminal connections

Product description

The Siemens SIRIUS 3RW4028-1BB05 is a size S0 soft starter designed for smooth motor acceleration. It has a rated current of 38 A and is suitable for motor ratings up to 22 kW at 500 V. The control voltage range is 400-600 V AC, with a 24 V AC/DC coil. This soft starter is equipped with screw terminals for secure connections and is rated for operation at 40°C ambient temperature.

This soft starter is used to reduce the mechanical stress on machinery and electrical stress on the power supply during motor start-up. It is commonly applied in industries such as material handling, pumps, fans, compressors, and general manufacturing where smooth starting is required to prevent system shock and reduce peak current draw.

Stanlo Automation, a veteran-owned surplus industrial parts distributor, offers the Siemens SIRIUS 3RW4028-1BB05 soft starter. Ensure efficient and reliable motor control with quality surplus components from Stanlo Automation.

Technical specifications

Series	SIRIUS 3RW40
Size	S0
Rated Current	38 A
Max Motor Power	22 kW @ 500 V
Control Voltage	400-600 V AC
Coil Voltage	24 V AC/DC
Terminals	Screw

Common applications

Pump control

Fan control

Conveyor systems

Compressors

Material handling

General machinery

Compatible systems

Three-phase AC Motors (380-600V)

Also known as

Siemens 3RW40 Soft Starter 3RW40281BB05 SIRIUS Soft Starter S0

Replaces / compatible with

Provides a smooth start for three-phase AC motors, replacing direct-on-line starters where high inrush currents are problematic.

Technical note

Expert tip

Ensure the 24V AC/DC control voltage is correctly applied to the coil terminals for proper operation of the soft starter.

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Frequently asked questions

What is the maximum motor power that the Siemens 3RW4028-1BB05 soft starter can handle?

The Siemens SIRIUS 3RW4028-1BB05 soft starter (size S0) can handle a maximum motor power of 22 kW at a voltage of 500 V.