Siemens SIRIUS 3RW4027-1BB05 Soft Starter - 32A, 18.5 kW

Siemens SIRIUS 3RW4027-1BB05 S0 Soft Starter - 32A, 18.5 kW

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ManufacturerSiemens

Part number3RW4027-1BB05

Frame Size S0

Rated Operational Current 32A (at 40°C)

Motor Power 18.5 kW (at 500V) / 15 kW (at 400V)

Supply Voltage 400-600V AC

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Soft start and ramp-down Integrated bypass contact system Intrinsic device protection Adjustable current limitation Screw terminals Compact design

Product description

The Siemens SIRIUS 3RW4027-1BB05 is a soft starter designed for smooth motor acceleration and deceleration. It features an S0 frame size and a rated operational current of 32A at 40°C, capable of handling 18.5 kW at 500V or 15 kW at 400V. This unit operates with a main circuit voltage range of 400-600V AC and a control supply voltage of 24V AC/DC, utilizing screw terminals for connection.

This soft starter is ideal for applications requiring reduced mechanical stress and controlled power ramp-up, such as pumps, fans, and conveyor systems. Its integrated bypass contact system ensures low heat dissipation during run operation and improved efficiency. The device offers intrinsic device protection and adjustable current limitation for enhanced motor safety.

Source your Siemens 3RW4027-1BB05 from Stanlo Automation for reliable industrial surplus parts. We ensure quality and availability for your automation needs, backed by our veteran-owned business commitment.

Technical specifications

Frame Size	S0
Rated Operational Current	32A (at 40°C)
Motor Power	18.5 kW (at 500V) / 15 kW (at 400V)
Supply Voltage	400-600V AC
Control Voltage	24V AC/DC
Connection Type	Screw Terminals
Protection	Intrinsic Device Protection, Adjustable Current Limitation
Bypass	Integrated Bypass Contact System
IP Rating	IP20

Common applications

Pump control

Fan control

Conveyor systems

Machine tools

Compressors

General motor starting

Compatible systems

Compatible with standard three-phase asynchronous motors.

Also known as

SIRIUS 3RW40 Soft Starter Siemens Soft Starter S0

Replaces / compatible with

Replaces older or less efficient motor starting methods like direct online starters or star-delta starters for smoother operation.

Technical note

Expert tip

Ensure proper ventilation as the integrated bypass generates heat during motor run, even though it reduces overall dissipation compared to star-delta starters.

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Frequently asked questions

What is the maximum motor power for the Siemens 3RW4027-1BB05?

The Siemens 3RW4027-1BB05 is rated for a maximum motor power of 18.5 kW at 500V or 15 kW at 400V in a standard circuit configuration.