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Siemens 3RW4028-1TB04 SIRIUS Soft Starter - 38A 18.5kW

Siemens 3RW4028-1TB04 SIRIUS soft starter, 38A, S0 size.

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ManufacturerSiemens

Part number3RW4028-1TB04

Series SIRIUS 3RW40

Size S0

Rated Current 38A

Motor Power 18.5 kW @ 400V

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Smooth motor starting 38A rated current 18.5kW motor power capacity Integrated thermistor motor protection 200-480V AC control Screw terminals

Product description

The Siemens 3RW4028-1TB04 is a SIRIUS soft starter, size S0, designed for smooth and controlled starting of three-phase motors. It offers a rated current of 38A and is suitable for motor power ratings up to 18.5 kW at 400V (50/60 Hz). This soft starter operates with control voltages of 200-480V AC and 24V AC/DC, providing flexibility in system integration. The unit features screw terminals for secure electrical connections and integrated thermistor motor protection to safeguard the motor from overheating.

This soft starter is engineered to reduce mechanical stress on machinery and electrical stress on the power supply during motor startup by gradually increasing voltage. It is widely used in applications such as conveyor systems, pumps, fans, and compressors where smooth acceleration is crucial. The SIRIUS 3RW40 series offers reliable performance and essential protection features for motor control circuits.

Stanlo Automation, your veteran-owned source for surplus industrial automation parts, provides the Siemens 3RW4028-1TB04. We ensure quality and availability of essential components to minimize downtime and optimize your automation investments.

Technical specifications

Series	SIRIUS 3RW40
Size	S0
Rated Current	38A
Motor Power	18.5 kW @ 400V
Control Voltage	200-480V AC, 24V AC/DC
Terminals	Screw
Motor Protection	Thermistor

Common applications

Conveyor systems

Pump control

Fan control

Compressors

Material handling

Machine tools

Industrial automation

Compatible systems

Three-phase induction motors Siemens PLC systems Industrial control panels

Also known as

Siemens SIRIUS soft starter 3RW40 soft starter

Replaces / compatible with

This soft starter is designed to replace direct-on-line starters or other older soft starter models, providing improved motor control and protection.

Technical note

Expert tip

Ensure the control voltage supply (24V AC/DC) is correctly wired to the designated terminals for proper soft starter operation and protection activation.

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Frequently asked questions

What type of motor protection is included with the Siemens 3RW4028-1TB04 soft starter?

The Siemens 3RW4028-1TB04 soft starter includes integrated thermistor motor protection. This feature monitors the motor's temperature via connected PTC thermistors to prevent overheating and potential damage.