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Siemens SIRIUS 3RW44 Soft Starter - 356A

Siemens SIRIUS 3RW44 soft starter, 356A at 400V.

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ManufacturerSiemens

Part number3RW4446-6BC44

Type Soft Starter

Series SIRIUS 3RW44

Voltage 200-460 V AC

Standard Current (400V) 356 A

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Smooth motor acceleration Reduced starting current and torque Protects motor and mechanical parts Wide operating voltage range Screw terminal connections Phased-out product

Product description

The Siemens SIRIUS 3RW4446-6BC44 is a high-performance soft starter designed for smooth acceleration of three-phase motors. Rated for 400V, it offers a standard current of 356 A and 200 kW motor power, with an inside-delta rating of 617 A and 355 kW. It operates on a voltage range of 200-460 V AC and features screw terminals for easy connection.

This soft starter is suitable for a wide range of industrial applications requiring controlled motor startup, including pumps, fans, compressors, and conveyors. Its ability to reduce starting torque and current helps protect motor windings and mechanical components, extending equipment life.

As a phased-out product, Stanlo Automation offers this Siemens 3RW4446-6BC44 as surplus inventory. While a successor model (3RW5546-6HA14) is available, we provide this reliable option for your existing systems. Source your industrial automation needs from Stanlo Automation.

Technical specifications

Type	Soft Starter
Series	SIRIUS 3RW44
Voltage	200-460 V AC
Standard Current (400V)	356 A
Standard Power (400V)	200 kW
In-delta Current (400V)	617 A
In-delta Power (400V)	355 kW
Terminals	Screw

Common applications

Pump control

Fan control

Conveyor systems

Compressor starting

Industrial machinery

Material handling

Also known as

Siemens Soft Starter 3RW44 3RW44466BC44

Replaces / compatible with

This is a phased-out product. The preferred successor type is SIRIUS 3RW5546-6HA14.

Technical note

Expert tip

This model is phased out; consider its successor, the 3RW55 series, for new installations or upgrades, though this unit remains functional for existing setups.

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Frequently asked questions

What are the standard and in-delta current ratings for the Siemens 3RW4446-6BC44 soft starter at 400V?

At 400V and 40°C, the Siemens 3RW4446-6BC44 soft starter has a standard current rating of 356 A. When connected in-delta, its current rating increases to 617 A.