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Siemens 3RW4201-8RB25-4SW0 Sirius Soft Starter

Siemens SIRIUS Soft Starter 3RW4201-8RB25-4SW0 for motors up to 75kW.

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ManufacturerSiemens

Part number3RW4201-8RB25-4SW0

Motor Power 75 kW (at 400V)

Rated Operational Current 165 A

Voltage 400 V

Series SIRIUS

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12-month warranty

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Veteran-owned

CAGE: 9NK75

Smooth Motor Acceleration Reduced Mechanical Stress Integrated Bypass Reduced Starting Current 75kW Power Rating

Product description

The Siemens 3RW4201-8RB25-4SW0 is a SIRIUS soft starter designed for smooth acceleration of three-phase asynchronous motors. It provides controlled starting torque, reducing mechanical stress on the motor and connected machinery. This unit has a power rating of 75kW at 400V and a rated operational current of 165A.

This soft starter is ideal for applications where high starting currents or mechanical shocks need to be avoided, such as conveyor belts, pumps, and fans. It offers integrated bypass contactors for efficient operation and reduced heat loss during continuous running.

Stanlo Automation, a veteran-owned distributor, offers the Siemens 3RW4201-8RB25-4SW0. We provide a reliable source for surplus industrial automation components.

Technical specifications

Motor Power	75 kW (at 400V)
Rated Operational Current	165 A
Voltage	400 V
Series	SIRIUS
Type	Soft Starter

Common applications

Conveyor Systems

Pump Control

Fan Control

Compressor Starters

Industrial Machinery

Compatible systems

Three-phase asynchronous motors Siemens SIRIUS motor protection systems

Also known as

Siemens SIRIUS Soft Starter 3RW42 Soft Starter

Replaces / compatible with

Replaces direct-on-line starters where reduced starting torque is required. Compatible with Siemens SIRIUS motor protection devices.

Technical note

Expert tip

Ensure proper heat dissipation by mounting the soft starter in a well-ventilated enclosure according to manufacturer guidelines.

What happens next?

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Frequently asked questions

What is the maximum motor power for the Siemens 3RW4201-8RB25-4SW0?

The Siemens SIRIUS soft starter 3RW4201-8RB25-4SW0 is rated for motors up to 75 kW at a voltage of 400V. Its rated operational current is 165A.