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Siemens 3RW4427-1BC35 SIRIUS Soft Starter - Phased Out

Siemens 3RW4427-1BC35 SIRIUS soft starter.

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ManufacturerSiemens

Part number3RW4427-1BC35

Voltage 400-600 V AC

Control Voltage 115 V AC

Standard Current 82 A (575V, 50°C)

Inside-Delta Current 142 A

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Veteran-owned

CAGE: 9NK75

Smooth motor ramp-up Reduced mechanical shock Current limiting during start Overload protection Energy efficient Screw terminal connections

Product description

The Siemens 3RW4427-1BC35 is a robust SIRIUS soft starter designed for heavy-duty motor applications. It offers 82 A at 575 V (50°C standard) and 142 A inside-delta, with significant power capacities of 75 hp and 125 hp, respectively. This unit operates on 400-600 V AC and uses 115 V AC for control, featuring screw terminals for secure connections.

This soft starter is ideal for demanding industrial applications, including large pumps, fans, compressors, and conveyors, where smooth acceleration and reduced mechanical stress are paramount. It helps to protect motors and driven equipment from the harsh effects of direct-on-line starting. Applications span across various sectors like power generation, water treatment, and large-scale manufacturing.

As a veteran-owned surplus parts specialist, Stanlo Automation is dedicated to sourcing and supplying obsolete and hard-to-find automation components. We provide the Siemens 3RW4427-1BC35, enabling you to maintain and repair your existing systems efficiently. Choose Stanlo Automation for reliable surplus parts and exceptional service.

Technical specifications

Voltage	400-600 V AC
Control Voltage	115 V AC
Standard Current	82 A (575V, 50°C)
Inside-Delta Current	142 A
Standard Power	75 hp (575V, 50°C)
Inside-Delta Power	125 hp
Terminals	Screw

Common applications

Heavy-duty motor control

Large pump systems

Industrial fans

Conveyor systems

Water treatment plants

Power generation

Compatible systems

Siemens SIRIUS motor control systems

Also known as

Siemens SIRIUS 3RW44 3RW4427 soft starter Siemens 82A soft starter

Replaces / compatible with

This product is phased out. The preferred successor is the Siemens 3RW5527-1HA16.

Technical note

Expert tip

For optimal performance and longevity, ensure the motor and the soft starter are correctly matched for current and power ratings, especially when using the inside-delta configuration.

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Frequently asked questions

What is the operational voltage and control voltage for the Siemens 3RW4427-1BC35?

The Siemens 3RW4427-1BC35 soft starter operates on a main voltage of 400-600V AC and uses a control voltage of 115V AC. It is designed for heavy-duty applications with current ratings up to 142A (inside-delta).