3RW4028-1TB05

The Siemens SIRIUS 3RW4028-1TB05 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 comes with 24V AC/DC control voltage and screw terminals, and supports thermal resistance motor protection input.

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Siemens 3RW4028-1TB05 SIRIUS soft starter thermal resistance protection product image

Product Positioning

The 3RW4028-1TB05 is a soft starter from the Siemens SIRIUS 3RW40 series, with a rated current of 38A. It is suitable for 400 to 600V AC high-voltage three-phase motors and features thermal resistance motor protection input.

Core Product Advantages and Features

Thermal resistance motor protection input

It can be connected to the motor's built-in thermistor to provide more accurate temperature monitoring than general overload protection.

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.

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
Motor protection input	Thermal resistance type (Thermistor)
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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