3RW4028-1BB04

The Siemens SIRIUS 3RW4028-1BB04 soft starter has an S0 frame and a rated current of 38A. It is suitable for 200 to 480V AC three-phase motors, corresponding to 18.5kW/400V. It comes with a 24V AC/DC control voltage and screw terminals, which is a common standard control voltage model.

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Siemens 3RW4028-1BB04 SIRIUS Soft Starter 24V Product Image

Product Positioning

The 3RW4028-1BB04 is a Siemens SIRIUS 3RW40 series soft starter with a rated current of 38A. It is suitable for 200 to 480V AC three-phase motors and has a control voltage of 24V AC/DC.

Core Product Advantages and Features

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.

Gradual start and stop

Thyristor control reduces the instantaneous current surge during startup, thereby reducing mechanical stress and grid voltage drop.

Built-in bypass connection

After startup, it automatically bypasses the circuit to reduce operating losses and heat generation.

Compact S0 base

Its compact size makes it suitable for existing distribution panels with limited installation space.

project	Specification
Rated current	38 A (40°C)
Corresponding power/voltage	18.5 kW / 400 V
Applicable voltage range	200-480 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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