3RW4028-1BB05

The Siemens SIRIUS 3RW4028-1BB05 soft starter, with an S0 frame and a rated current of 38A, is suitable for 400 to 600V AC high-voltage three-phase motors, corresponding to 22kW/500V. It is equipped with a 24V AC/DC control voltage and screw terminals, making it suitable for starting motors in high-voltage power grid applications.

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Siemens 3RW4028-1BB05 SIRIUS Soft Starter 24V Product Image

Product Positioning

The 3RW4028-1BB05 is a Siemens SIRIUS 3RW40 series soft starter with a rated current of 38A. It is suitable for 400 to 600V AC high-voltage three-phase motors and has a control voltage of 24V AC/DC.

Core Product Advantages and Features

High-voltage grid compatibility

With an operating voltage range of 400 to 600V AC, it is suitable for three-phase motors in some high-voltage power distribution environments.

Standard 24V control voltage

The control power supply is 24V AC/DC, which is compatible with common PLCs and DC power supplies, facilitating system integration.

Built-in bypass connection

After startup, switch to bypass operation to reduce energy consumption and heat generation during operation.

Gradual start and stop

The starting current curve is controlled by a thyristor to reduce the mechanical shock at the moment of startup.

project	Specification
Rated current	38 A (40°C)
Corresponding power/voltage	22 kW / 500 V
Applicable voltage range	400-600 V AC
Control power supply voltage	24 V AC/DC
Terminal block type	Screw terminals
Base size	S0
External dimensions	45 x 125 x 155 mm
Enclosure protection rating	IP20 (Front-facing touch safety)
Insulation voltage	600 V
Pollution level	Level 3 (according to IEC 60947-4-2)
Power components	Thyristor
Product Series	SIRIUS 3RW40

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