Siemens SIRIUS 3RW4444-2BC34 Soft Starter - Phased Out

Siemens SIRIUS 3RW4444-2BC34 Soft Starter (Phased Out).

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ManufacturerSiemens

Part number3RW4444-2BC34

Series SIRIUS 3RW44

Standard Rating (460V) 215 A, 150 hp

Inside-Delta Rating 372 A, 300 hp

Voltage 200-460 V AC

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Controlled Motor Starting Reduced Mechanical Stress Reduced Electrical Stress Spring-Type Terminals Designed for 460V Systems

Product description

The Siemens 3RW4444-2BC34 is a SIRIUS soft starter, now a phased-out product, with its preferred successor being the 3RW5544-2HA14. This unit is designed for controlled motor starting. Standard ratings at 460V, 50°C are 215A and 150 hp, while inside-delta ratings are 372A and 300 hp. It operates on 200-460V AC and has a 115V AC control voltage, featuring spring-type terminals.

Soft starters like the 3RW4444-2BC34 are used to reduce the mechanical stress on machinery and electrical stress on the power supply during motor start-up. Applications include pumps, fans, conveyors, and compressors in manufacturing, water treatment, and HVAC systems.

Stanlo Automation, a veteran-owned surplus distributor, offers this phased-out Siemens 3RW4444-2BC34 soft starter. While a successor is available, we can help you source this part if it's critical for your existing system or for spare inventory. Contact us for availability.

Technical specifications

Series	SIRIUS 3RW44
Standard Rating (460V)	215 A, 150 hp
Inside-Delta Rating	372 A, 300 hp
Voltage	200-460 V AC
Control Voltage	115 V AC
Terminals	Spring-type
Status	Phased-out

Common applications

Pump Control

Fan Control

Conveyor Systems

Compressor Start-up

General Motor Control

Manufacturing Equipment

Compatible systems

Motors up to 300 hp (inside-delta) Siemens control systems

Also known as

Siemens 3RW44 Soft Starter 3RW44442BC34 SIRIUS Motor Starter

Replaces / compatible with

Phased-out product. Successor is SIRIUS 3RW5, preferred successor type is >>3RW5544-2HA14<<.

Technical note

Expert tip

When replacing this phased-out unit, ensure the new 3RW55 series starter is correctly configured for the motor and application to maintain similar starting characteristics.

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Frequently asked questions

What are the standard and inside-delta current ratings for the Siemens 3RW4444-2BC34 soft starter at 460V?

At 460V and 50°C, the Siemens 3RW4444-2BC34 has a standard current rating of 215A (150 hp) and an inside-delta current rating of 372A (300 hp).