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Siemens 3RW4426-1BC45 SIRIUS Soft Starter - Phased Out

Siemens 3RW4426-1BC45 SIRIUS soft starter.

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ManufacturerSiemens

Part number3RW4426-1BC45

Voltage 400-600 V AC

Control Voltage 230 V AC

Standard Current 77 A (500V, 40°C)

Inside-Delta Current 133 A

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Veteran-owned

CAGE: 9NK75

High starting torque control Reduced inrush current Soft stop functionality Integrated overload protection Energy saving Screw terminals

Product description

The Siemens 3RW4426-1BC45 is a high-performance SIRIUS soft starter designed for demanding motor applications. It provides 77 A at 500 V (40°C standard) and 133 A inside-delta, with substantial power ratings of 45 kW and 90 kW, respectively. This starter operates on 400-600 V AC and uses 230 V AC for control, featuring convenient screw terminals.

This soft starter is engineered for industrial environments where smooth and controlled acceleration of large motors is essential. It effectively reduces mechanical stress on equipment and electrical stress on the power grid during startup. Applications include heavy-duty conveyors, large pumps, compressors, and industrial machinery in manufacturing and process industries.

Stanlo Automation, a veteran-owned distributor, is your trusted source for surplus and obsolete industrial automation components. We offer the Siemens 3RW4426-1BC45 to help you maintain operational continuity. Rely on Stanlo Automation for quality parts and expert support to keep your systems running efficiently.

Technical specifications

Voltage	400-600 V AC
Control Voltage	230 V AC
Standard Current	77 A (500V, 40°C)
Inside-Delta Current	133 A
Standard Power	45 kW (500V, 40°C)
Inside-Delta Power	90 kW
Terminals	Screw

Common applications

Heavy-duty motor control

Industrial conveyors

Large pump systems

Compressor control

Manufacturing automation

Process industries

Compatible systems

Siemens SIRIUS motor control systems

Also known as

Siemens SIRIUS 3RW44 series 3RW4426 soft starter Siemens 77A soft starter

Replaces / compatible with

This product is phased out. The preferred successor is the Siemens 3RW5526-1HA16.

Technical note

Expert tip

Utilize the inside-delta connection for higher power applications, ensuring the motor windings are correctly configured to handle the increased current and voltage.

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Frequently asked questions

What is the maximum power rating for the Siemens 3RW4426-1BC45 soft starter?

The Siemens 3RW4426-1BC45 soft starter can handle up to 90 kW (or 120 hp) in inside-delta configuration and 45 kW (or 60 hp) in standard configuration at 500V (40°C). Its current ratings are 133A inside-delta and 77A standard.