3RW4028-2TB04

The Siemens SIRIUS 3RW4028-2TB04 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 a 24V AC/DC control voltage. It uses spring terminals and supports thermal resistance motor protection input.

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Siemens 3RW4028-2TB04 SIRIUS soft starter spring terminal product image

Product Positioning

The 3RW4028-2TB04 is a soft starter from the Siemens SIRIUS 3RW40 series. It has a rated current of 38A, uses spring terminals, and features a thermal resistance motor protection input, making it suitable for applications requiring fast wiring and precise motor temperature protection.

Core Product Advantages and Features

Spring-loaded terminal design

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

Thermal resistance motor protection input

It can be connected to the motor's built-in thermistor to provide more accurate over-temperature protection.

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 mechanical shock during startup.

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
Motor protection input	Thermal resistance type (Thermistor)
Base size	S0
Enclosure protection rating	IP20
Built-in bypass	yes
Power components	Thyristor
Product Series	SIRIUS 3RW40

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