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Siemens SIRIUS 3RW40 Soft Starter - 38A

Siemens SIRIUS 3RW40 soft starter, S0 size, 38A, with thermistor motor protection.

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ManufacturerSiemens

Part number3RW4028-1TB05

Series SIRIUS 3RW40

Size S0

Rated Operational Current 38 A

Motor Power 22 kW @ 500 V

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Smooth Motor Starting 38A Rated Current Thermistor Motor Protection 24V AC/DC Control Screw Terminals SIRIUS Design

Product description

The Siemens SIRIUS 3RW40 soft starter, part number 3RW4028-1TB05, is designed for smooth starting of three-phase asynchronous motors. This S0-sized device handles a rated operational current of 38 A and supports motor ratings up to 22 kW at 500 V. It operates within a voltage range of 400-600 V AC for the main circuit and is controlled by a 24 V AC/DC signal.

This soft starter features screw terminals for easy connection and includes integrated thermistor motor protection to safeguard the motor from overheating. It is crucial for applications requiring reduced mechanical stress during startup, such as conveyor systems, pumps, and fans, by controlling torque and limiting inrush current.

Stanlo Automation, a veteran-owned distributor of surplus industrial parts, offers the Siemens 3RW4028-1TB05. We provide reliable and quality components to help you maintain and optimize your industrial automation systems efficiently.

Technical specifications

Series	SIRIUS 3RW40
Size	S0
Rated Operational Current	38 A
Motor Power	22 kW @ 500 V
Control Voltage	24 V AC/DC
Main Circuit Voltage	400-600 V AC
Terminals	Screw
Protection	Thermistor Motor Protection

Common applications

Motor Control

Pump Systems

Fan Control

Conveyor Systems

Compressors

Industrial Machinery

Automation

Compatible systems

Compatible with standard three-phase asynchronous motors and Siemens motor protection relays.

Also known as

Siemens soft starter 38A SIRIUS 3RW40 3RW40 Soft Starter

Replaces / compatible with

This soft starter is designed to replace direct-on-line starters or star-delta starters in applications where controlled motor acceleration is needed.

Technical note

Expert tip

Ensure the control voltage (24V AC/DC) is correctly applied to the terminal block for proper operation and safety features.

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Frequently asked questions

What is the maximum motor power that can be controlled by the Siemens 3RW4028-1TB05?

The Siemens 3RW4028-1TB05 soft starter can control three-phase asynchronous motors up to 22 kW at a voltage of 500 V. It handles a rated operational current of 38 A.