3RW4028-2BB04

The Siemens SIRIUS 3RW4028-2BB04 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, and is equipped with 24V AC/DC control voltage. It features a spring terminal design for screwless locking and quick and convenient wiring.

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Siemens 3RW4028-2BB04 SIRIUS soft starter spring terminal product image

Product Positioning

The 3RW4028-2BB04 is a Siemens SIRIUS 3RW40 series soft starter with a rated current of 38A. It features a spring terminal design and is suitable for three-phase motor starting applications that require quick wiring and maintenance.

Core Product Advantages and Features

Spring-loaded terminal design

Screwless fastening, quick wiring, and long-term durability to prevent loosening, facilitating maintenance.

Built-in bypass connection

After startup, it automatically switches to bypass operation to reduce operating losses and heat generation.

Gradual start and stop

Thyristor-controlled starting current curve reduces mechanical stress during startup.

Compact S0 base

Its compact size makes it suitable for control boxes 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	Spring terminals
Base size	S0
Enclosure protection rating	IP20
Built-in bypass	yes
Power components	Thyristor
Product Series	SIRIUS 3RW40

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