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Siemens SIRIUS 3RW4455-6BC35 Soft Starter (Phased Out)

Siemens SIRIUS Soft Starter 3RW4455-6BC35 (Phased Out)

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ManufacturerSiemens

Part number3RW4455-6BC35

Standard Current 615 A (at 575V, 50°C)

Inside-Delta Current 1065 A (at 575V, 50°C)

Operating Voltage 400-600 V AC

Control Voltage 115 V AC

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Smooth motor acceleration Reduces inrush current Protects motor and power system 615A standard rating 400-600V AC operation Screw terminals

Product description

The Siemens 3RW4455-6BC35 is a SIRIUS soft starter, a component designed to gradually increase the voltage applied to an electric motor, reducing the mechanical stress and electrical current surge during startup. This particular model handles standard values of 615A and inside-delta values of 1065A at 575V and 50°C. It operates on 400-600V AC power and features screw terminals for connection, along with a 115V AC control voltage.

Soft starters are essential for applications involving large motors where high inrush currents can cause significant wear and tear or power system disturbances. They are widely used in pumps, fans, compressors, conveyors, and other industrial machinery to ensure smoother operation and extend equipment lifespan.

This product is marked as phased out, with the preferred successor being the SIRIUS 3RW5553-6HA16. Stanlo Automation, a veteran-owned supplier of surplus industrial automation parts, offers this component as available stock. We ensure that our customers can source even discontinued parts to maintain their existing systems.

Technical specifications

Standard Current	615 A (at 575V, 50°C)
Inside-Delta Current	1065 A (at 575V, 50°C)
Operating Voltage	400-600 V AC
Control Voltage	115 V AC
Terminals	Screw
Product Status	Phased-out
Successor	3RW5553-6HA16

Common applications

Motor control

Pumps

Fans

Compressors

Conveyors

Industrial machinery

Heavy duty starting

Compatible systems

Motors Industrial control panels

Also known as

SIRIUS 3RW44 Series Siemens soft starter 615A

Replaces / compatible with

Phased-out product. Successor is SIRIUS 3RW5, preferred successor type is 3RW5553-6HA16.

Technical note

Expert tip

This soft starter is a phased-out product. Ensure compatibility or plan for migration to the successor model 3RW5553-6HA16 for future support.

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Frequently asked questions

What are the key current ratings for the Siemens 3RW4455-6BC35 soft starter?

The Siemens 3RW4455-6BC35 soft starter has a standard rating of 615A at 575V and 50°C. For inside-delta connections, it handles 1065A. It operates on 400-600V AC.