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Siemens SIRIUS 3RW40 Soft Starter: 75kW, 106A, 400-600V AC, S3

Siemens SIRIUS 3RW40 soft starter for 75kW motors.

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ManufacturerSiemens

Part number3RW4047-1BB05

Motor Power 75 kW (at 500 V)

Rated Current 106 A

Voltage Range 400-600 V AC

Control Voltage 24 V AC/DC

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Soft Starter 75 kW Motor Power 106 A Current Rating 400-600 V AC Operating Voltage 24 V AC/DC Control S3 Duty Cycle

Product description

The Siemens SIRIUS 3RW4047-1BB05 is a soft starter designed for smooth and controlled acceleration of three-phase motors. It is rated for 75 kW at 500V and a service factor of S3 (heavy-duty cyclic operation) at 40°C, with a continuous current rating of 106 A. The operating voltage range is 400-600V AC, and it requires a 24V AC/DC control voltage.

This soft starter utilizes screw terminals for secure connections and is built for demanding industrial applications requiring reliable motor starting. It helps reduce mechanical stress on the motor and connected equipment during startup.

Stanlo Automation, a veteran-owned distributor of surplus industrial parts, offers this Siemens SIRIUS soft starter. Ensure smooth motor operation and protect your equipment by purchasing the 3RW4047-1BB05 from Stanlo.

Technical specifications

Motor Power	75 kW (at 500 V)
Rated Current	106 A
Voltage Range	400-600 V AC
Control Voltage	24 V AC/DC
Service Factor	S3 (at 40°C)
Terminals	Screw

Common applications

Motor Control

Industrial Machinery

Pumps

Compressors

Conveyors

Fans

Compatible systems

Three-phase AC Induction Motors Control Systems requiring 24V AC/DC input

Also known as

SIRIUS 3RW40 Siemens Soft Starter 3RW40471BB05

Replaces / compatible with

Replaces traditional direct-on-line or star-delta starters for smoother motor acceleration and reduced mechanical stress. Compatible with various Siemens SIRIUS components.

Technical note

Expert tip

For applications with frequent starts or high inertia loads, ensure the S3 duty cycle rating and thermal protection are adequately addressed.

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Frequently asked questions

What is the maximum motor power for the Siemens 3RW4047-1BB05 soft starter at 400V?

The Siemens SIRIUS 3RW4047-1BB05 soft starter is rated for 75 kW at 500V. At 400V, the power rating would typically be lower, around 55 kW, depending on the specific motor and application requirements.