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Siemens SIRIUS Soft Starter (3RW4038-2BB15) - 72A, 45kW, 400-600V AC

Siemens SIRIUS S2 Soft Starter.

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ManufacturerSiemens

Part number3RW4038-2BB15

Product Series SIRIUS

Type Soft Starter S2

Rated Operational Current 72 A

Max Motor Power 45 kW at 500 V

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Smooth Motor Starting Reduced Mechanical Stress Spring-Type Terminals 72A Rating 45kW Motor Capacity Wide Voltage Range

Product description

The Siemens SIRIUS Soft Starter (3RW4038-2BB15) is designed for smooth and controlled starting of three-phase motors. This unit has a rated operational current of 72A and is suitable for motors up to 45kW at 500V. It operates within a main circuit voltage range of 400-600V AC and a control circuit voltage range of 110-230V AC/DC. The soft starter is rated for operation at 40°C ambient temperature.

Featuring convenient spring-type terminals, installation and wiring are streamlined. This soft starter helps to reduce mechanical stress on machinery and electrical load on the power supply during motor start-up, thereby extending the life of connected equipment and improving system efficiency.

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Technical specifications

Product Series	SIRIUS
Type	Soft Starter S2
Rated Operational Current	72 A
Max Motor Power	45 kW at 500 V
Rated Operational Voltage	400-600 V AC
Control Voltage	110-230 V AC/DC
Ambient Temperature	40 °C
Terminals	Spring-type

Common applications

Motor Control Panels

Conveyor Systems

Pump Stations

Fan Control

Compressors

Compatible systems

Three-phase induction motors up to 45kW at 500V

Also known as

Siemens 3RW40 Soft Starter; SIRIUS S2 Motor Starter; 3RW40382BB15; Siemens 72A Soft Starter

Replaces / compatible with

This SIRIUS 3RW40 soft starter is designed to provide controlled motor acceleration, replacing direct-on-line starters or star-delta starters where smoother start-up is required.

Technical note

Expert tip

Ensure the control voltage supply (110-230V AC/DC) is correctly wired to the spring-type terminals for proper operation of the 3RW4038-2BB15 soft starter.

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Frequently asked questions

What is the maximum motor power and voltage rating for the Siemens SIRIUS Soft Starter (3RW4038-2BB15)?

The Siemens SIRIUS Soft Starter (3RW4038-2BB15) can control motors up to 45 kW at 500 V. It operates with a main circuit voltage range of 400-600 V AC, making it suitable for a wide array of industrial motor applications.