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SIRIUS Soft Starter S12 by Siemens - 248A, 250hp

Siemens SIRIUS S12 soft starter, 248A, 250hp, 400-600V AC.

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ManufacturerSiemens

Part number3RW4074-2BB35

Rated Current 248 A

Rated Power 250 hp (at 575 V)

Operating Voltage 400-600 V AC

Control Voltage 115 V AC

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12-month warranty

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Same-day dispatch

Order by 2pm CST

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Worldwide delivery

US, EU, Asia, Middle East

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Veteran-owned

CAGE: 9NK75

Smooth Motor Starting Reduced Current Inrush Motor Protection Features Spring-type Terminals Wide Voltage Range

Product description

The Siemens SIRIUS soft starter, model 3RW4074-2BB35, is designed for smooth starting of three-phase motors. It is rated for 248 Amps and can handle motors up to 250 horsepower at 575 V, with operation at 50°C. The unit accepts a wide input voltage range of 400-600 V AC and requires 115 V AC for its control circuits. This model features spring-type terminals for secure connections.

This soft starter is ideal for applications requiring reduced mechanical stress during motor startup, such as conveyor systems, pumps, fans, and compressors. It helps to decrease current inrush, thereby reducing voltage dips and extending the life of motor and connected equipment.

As a veteran-owned business, Stanlo Automation specializes in providing reliable surplus industrial automation parts. We offer the Siemens SIRIUS 3RW4074-2BB35, acknowledging its phased-out status, and can help you source this or its preferred successor for your MRO needs.

Technical specifications

Rated Current	248 A
Rated Power	250 hp (at 575 V)
Operating Voltage	400-600 V AC
Control Voltage	115 V AC
Temperature	50 °C
Terminals	Spring-type

Common applications

Conveyor Systems

Pump Control

Fan Control

Compressor Starters

Industrial Machinery

Motor Applications

Compatible systems

Three-phase AC motors Motor control circuits

Also known as

SIRIUS Soft Starter S12 Siemens 3RW40 Soft Starter 3RW4074 Soft Starter

Replaces / compatible with

This is a phased-out product. The preferred successor is the Siemens SIRIUS 3RW5074-2AB15. It is compatible with SIRIUS 3RW5 accessories.

Technical note

Expert tip

As this is a phased-out product, ensure availability of spare parts or consider upgrading to the recommended SIRIUS 3RW5 series for long-term support.

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Frequently asked questions

What is the successor to the Siemens SIRIUS soft starter 3RW4074-2BB35?

The Siemens SIRIUS 3RW4074-2BB35 is a phased-out product. Its preferred successor is the SIRIUS 3RW5074-2AB15. It is designed to provide similar motor starting and protection functionalities.