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Siemens SIRIUS 3RW44 Soft Starter - 57A, 37kW (500V)

Siemens SIRIUS 3RW44 soft starter, 57A, 37kW (500V). Phased-out.

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ManufacturerSiemens

Part number3RW4425-1BC45

Standard Current (500V) 57 A

Standard Power (500V) 37 kW

Inside-Delta Current (500V) 99 A

Inside-Delta Power (500V) 55 kW

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Veteran-owned

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Smooth motor starting Reduces mechanical stress Reduces electrical stress 400-600V AC operation 230V AC control coil

Product description

The Siemens SIRIUS 3RW4425-1BC45 is a soft starter designed for smooth motor acceleration. At 500V and 40°C, it has standard ratings of 57A and 37kW, with inside-delta ratings of 99A and 55kW. It operates on a 400-600V AC power supply with a 230V AC control voltage and features screw terminals. Please note, this is a phased-out product.

This soft starter is used to reduce the mechanical and electrical stress on motors and drive trains during startup. Applications include pumps, fans, compressors, conveyors, and other machinery where smooth starts are beneficial to prevent system shock and reduce power demand surges.

Stanlo Automation, your veteran-owned surplus parts supplier, offers the Siemens 3RW4425-1BC45. Secure this component while available or explore its successor through Stanlo for your motor control needs.

Technical specifications

Standard Current (500V)	57 A
Standard Power (500V)	37 kW
Inside-Delta Current (500V)	99 A
Inside-Delta Power (500V)	55 kW
Voltage	400-600 V AC
Control Voltage	230 V AC
Terminals	Screw

Common applications

Pump control

Fan control

Conveyor systems

Compressor starting

Industrial machinery

Motor protection

Compatible systems

AC Induction Motors

Also known as

SIRIUS 3RW44 soft starter Siemens motor starter 3RW44

Replaces / compatible with

This is a phased-out product. The preferred successor is the SIRIUS 3RW5 series, with a specific type being 3RW5525-1HA16. It replaces traditional direct-on-line starters for smoother motor engagement.

Technical note

Expert tip

While this unit is phased out, its successor, the 3RW5 series, offers advanced features and improved efficiency for modern motor control applications.

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Frequently asked questions

What is the successor to the Siemens 3RW4425-1BC45 soft starter?

The Siemens 3RW4425-1BC45 is a phased-out product. Its preferred successor is the SIRIUS 3RW5 series, with the specific model 3RW5525-1HA16 being recommended.