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Siemens SIRIUS 3RW4434-2BC44 Soft Starter - 113A, 55kW (400V)

Siemens SIRIUS 3RW4434-2BC44 Soft Starter for smooth motor control.

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ManufacturerSiemens

Part number3RW4434-2BC44

Values at 400V, 40°C Standard 113A, 55kW

Voltage 200-460V AC

Control Voltage 230V AC

Terminals Spring-type

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12-month warranty

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Veteran-owned

CAGE: 9NK75

Soft Starting and Ramp-Down Integrated Bypass Contact System Intelligent Monitoring Functions Torque Control Compact Construction Spring-type Terminals

Product description

The Siemens SIRIUS 3RW4434-2BC44 is a high-feature soft starter designed for soft starting and ramp-down of three-phase asynchronous motors. At 400V and 40°C, it handles a standard current of 113A (55kW) and an inside-delta current of 196A (110kW). It operates on a 200-460V AC supply with 230V AC control voltage and features spring-type terminals for easy connection.

This soft starter is ideal for applications requiring reduced current peaks, minimized mechanical stress on drives, and prevention of voltage fluctuations during motor startup. Industries benefiting from its use include manufacturing, material handling, pumping systems, and HVAC, where smooth motor control is critical.

Stanlo Automation, a veteran-owned surplus distributor, offers this Siemens soft starter. We provide reliable components for your automation needs, ensuring quality and value. Contact us for availability and to secure this essential motor control component.

Technical specifications

Values at 400V, 40°C	Standard 113A, 55kW
Voltage	200-460V AC
Control Voltage	230V AC
Terminals	Spring-type

Common applications

Motor Control

Pump Systems

Fan Control

Conveyor Systems

Manufacturing

HVAC

Compatible systems

Three-phase asynchronous motors

Also known as

SIRIUS 3RW44 Soft Starter

Replaces / compatible with

This is a phased-out product. The preferred successor is SIRIUS 3RW5534-2HA14.

Technical note

Expert tip

Ensure the internal bypass contact system is properly utilized to minimize heat generation and extend the life of the starter.

What happens next?

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Frequently asked questions

What are the current ratings for the Siemens 3RW4434-2BC44 soft starter at 400V?

The Siemens 3RW4434-2BC44 soft starter has a standard current rating of 113A (55kW) and an inside-delta current rating of 196A (110kW) at 400V and 40°C.