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Siemens 3RW4075-6BB44 SIRIUS Soft Starter Item NO.: 3RW4075-6BB44

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356 A rated operational current at 40°C
200 kW motor output at 400 V
200–460 V AC main circuit · 230 V AC control

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Product Name	Siemens 3RW4075-6BB44 SIRIUS Soft Starter
Item NO.	3RW4075-6BB44
Weight	9 kg = 19.8416 lb = 317.4657 oz
Category	SIEMENS
Brand	AUTOMATION
Creation Time	2026-08-16

SIRIUS Motor Control

Siemens 3RW4075-6BB44 SIRIUS Soft Starter

356 A soft starter for three-phase motors up to 200 kW at 400 V, with integrated bypass, adjustable current limiting and electronic motor overload protection.

Rated current356 A at 40°C

Motor output200 kW at 400 V

Main voltage200–460 V AC

Control voltage230 V AC

01 · Product Overview

Controlled motor starting for demanding industrial drives

The Siemens 3RW4075-6BB44 is a SIRIUS 3RW40 soft starter in size S12. It controls the starting and stopping voltage of three-phase motors in a standard circuit, reducing mechanical shock and current peaks compared with direct-on-line starting. The unit is rated for 356 A at 40°C and 200 kW at 400 V.

An integrated bypass contact system reduces losses after the motor reaches operating speed. Adjustable current limitation, intrinsic device protection, electronic motor overload protection and external reset are integrated into the soft starter. Main-circuit connection is by busbar; auxiliary and control circuits use screw-type terminals.

02 · Product Specifications

Verified technical data

Manufacturer: Siemens

Product brand: SIRIUS

Article number: 3RW4075-6BB44

Product type: Soft starter

Device size: S12

Rated current: 356 A at 40°C

Rated motor output: 200 kW at 400 V

Main operating voltage: 200–460 V AC

Control supply: 230 V AC, 50/60 Hz

Operating frequency: 50–60 Hz

Insulation voltage: 600 V

Operating temperature: −25°C to +60°C

Storage temperature: −40°C to +80°C

Protection: IP00; IP20 with cover

Dimensions (W × H × D): 160 × 230 × 278 mm

Net weight: 9.0 kg

03 · Key Functions

Built-in starting and protection functions

Integrated bypassReduces device losses after completion of motor starting.

Current limitationAdjustable current limiting supports controlled acceleration.

Motor protectionElectronic motor overload protection is integrated.

Device protectionIntrinsic soft-starter protection monitors the power electronics.

External resetReset can be initiated through the designated control function.

Status signalingRed fault indication and auxiliary contacts support panel diagnostics.

04 · Product Technical Images

Connection and installation overview

STANDARD MOTOR CIRCUIT

3-Phase
Supply

→

3RW4075
Soft Starter

→

3-Phase
Motor

Functional overview based on the Siemens standard-circuit configuration; not a terminal wiring diagram.

INSTALLATION ENVELOPE

SIRIUS
3RW40
S12

W: 160 mm
H: 230 mm
D: 278 mm
Top clearance: 100 mm
Bottom clearance: 75 mm

Model-specific dimensional summary; verify panel design against current Siemens installation instructions.

05 · Applications

Industrial motor starting applications

The 3RW4075-6BB44 is used in standard-circuit three-phase motor feeders where controlled acceleration and stopping can reduce electrical and mechanical stress.

Pumps Fans Compressors Conveyors Industrial processing machines

06 · Lifecycle & Replacement

Discontinued product with an official preferred successor

Lifecycle statusPhased-out product

Discontinued since1 October 2023

Preferred successor3RW5075-6AB14

The preferred successor belongs to the SIRIUS 3RW5 generation. Before replacement, verify enclosure space, mounting clearances, busbar and control-terminal arrangement, supply voltages, motor current setting, protection coordination, auxiliary signaling and commissioning parameters. The successor should not be treated as an automatic drop-in replacement without an application review.

07 · Frequently Asked Questions

Buyer and replacement questions

What is the rated current of 3RW4075-6BB44?

The rated operational current is 356 A at an ambient temperature of 40°C. Siemens specifies lower values of 315 A at 50°C and 280 A at 60°C.

Which motor rating does this soft starter support?

In a standard circuit at 40°C, the official rating is 200 kW at 400 V and 110 kW at 230 V.

Does the unit include an integrated bypass?

Yes. The official Siemens data identifies an integrated bypass contact system together with thyristor power control.

Has Siemens discontinued 3RW4075-6BB44?

Yes. Siemens lists the product as phased out and discontinued since 1 October 2023.

Can 3RW5075-6AB14 replace it without changes?

It is the Siemens preferred successor, but replacement still requires checks of mechanical installation, connections, protection, settings and commissioning for the specific motor feeder.

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