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Siemens SIRIUS 3RW4436-6BC36 Soft Starter - 145A, 125HP

Siemens SIRIUS 3RW4436-6BC36 Soft Starter

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ManufacturerSiemens

Part number3RW4436-6BC36

Standard rating (575V) 145 A, 125 hp

Inside-delta rating 251 A, 250 hp

Main Voltage 400-690 V AC

Control Voltage 115 V AC

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Veteran-owned

CAGE: 9NK75

Smooth motor acceleration Reduced starting current High starting torque capability Inside-delta connection option Screw terminals

Product description

The Siemens 3RW4436-6BC36 is a SIRIUS soft starter designed for smooth acceleration of three-phase motors. This unit handles standard operation at 575 V and 50°C with ratings of 145 A and 125 hp. For higher demands, it supports an inside-delta connection providing 251 A and 250 hp. It operates on 400-690 V AC main voltage and 115 V AC control voltage, featuring screw terminals.

This soft starter is crucial for applications where motor starting current needs to be limited to reduce mechanical stress and electrical system load. It finds use in pumps, fans, compressors, conveyors, and other machinery that benefits from a gentle start. Industries include water treatment, manufacturing, and HVAC.

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Technical specifications

Standard rating (575V)	145 A, 125 hp
Inside-delta rating	251 A, 250 hp
Main Voltage	400-690 V AC
Control Voltage	115 V AC
Terminals	Screw

Common applications

Pump control

Fan control

Conveyor systems

Compressors

Manufacturing equipment

HVAC systems

Compatible systems

Three-phase AC motors Industrial control panels

Also known as

Siemens SIRIUS Soft Starter 3RW44 3RW44366BC36 Siemens Motor Starter

Replaces / compatible with

This is a phased-out product. The preferred successor is the SIRIUS 3RW5536-6HA16.

Technical note

Expert tip

For inside-delta connection, ensure the motor windings are designed to handle the increased current and that the starter is correctly sized for this configuration.

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Frequently asked questions

What are the amperage and horsepower ratings for the Siemens 3RW4436-6BC36 soft starter?

The Siemens 3RW4436-6BC36 soft starter is rated for 145 A and 125 hp at 575 V in standard configuration. When used in an inside-delta connection, it can handle 251 A and 250 hp.