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SIEMENS 3RW4076-6BB44 SIRIUS 3RW40 soft starter

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INDUSTRIAL AUTOMATION

SIEMENS · SIRIUS

3RW4076

-6BB44

SIRIUS S12

SOFT STARTER
MOTOR STARTING CONTROL

KEY SPECIFICATIONS

CURRENT

432

A / 40°C

MOTOR POWER

250

kW / 400 V

VOLTAGE

200–460

V AC

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Product Details

SIEMENS / SIRIUS

PRODUCT SYSTEM AMIKON CONTACT FAQ MODELS

SIRIUS 3RW40 • HIGH-CURRENT SOFT STARTING

3RW4076-6BB44

S12 Soft Starter for Standard Applications

High-current SIRIUS motor starting control

The Siemens 3RW4076-6BB44 is a SIRIUS 3RW40 soft starter in starter size S12. Its rated operational current is 432 A at 40°C, with a motor power rating of 250 kW at 400 V in the standard switching arrangement. The unit is designed for three-phase motor starting duties where controlled acceleration and reduced starting stress are required.

RATED CURRENT

432 A

at 40°C

MOTOR POWER

250 kW

at 400 V

MAIN VOLTAGE

200–460 V

AC, 50–60 Hz

TECHNICAL CORE

S12 / 432 A

Control supply	230 V AC
Operating frequency	50–60 Hz
Protection	IP20
Dimensions	160 × 230 × 278 mm

Integrated bridging contact system, thyristor technology, intrinsic device protection, motor overload protection and adjustable current limitation.

ENGINEERING PROFILE

Built around controlled motor starting

Power stage	Thyristor-based semiconductor power electronics with an integrated bridging contact system for standard soft-starting applications.
Motor protection	Motor overload protection is integrated. The adjustable motor rated-current setting has a minimum value of 207 A.
Current control	Adjustable current limitation is provided for controlled starting behavior. The unit supports a continuous operating current of 115% of Ie at 40°C.
Thermal capability	Rated operating current is 432 A at 40°C, 385 A at 50°C and 335 A at 60°C. The operating temperature range is −25°C to +60°C.

S12 / POWER ELECTRONICS

Product family	SIRIUS 3RW40
Starter size	S12
Rated current at 40°C	432 A
Motor power at 400 V	250 kW
Operating voltage	200–460 V AC
Frequency	50–60 Hz

Control supply	230 V AC
Main circuit poles	3
Main connection	Busbar connection
Auxiliary/control connection	Screw-type terminals
Protection class	IP20
Weight	Approx. 8.808 kg

INSTALLATION

Panel-ready scale

Width 160 mm	Height 230 mm	Depth 278 mm
Upper clearance 100 mm	Side clearance 5 mm	Lower clearance 75 mm
Mounting is by screw fixing. Installation altitude is specified up to 5,000 m above sea level.

SERIES / SYSTEM POSITION

Where 3RW4076-6BB44 sits in SIRIUS

The 3RW4076-6BB44 belongs to the SIRIUS 3RW40 soft starter family. The S12 frame places it in the high-current section of this family, making the complete order code important when matching a replacement.

FAMILY

3RW40

Soft starters for standard applications, using semiconductor thyristor technology and integrated bridging contact architecture.

3RW4075-6BB44

356 A

200 kW at 400 V / 40°C

3RW4076-6BB44

432 A

250 kW at 400 V / 40°C

3RW4073-6BB44

230 A

132 kW at 400 V / 40°C

Replacement planning

Siemens identifies the SIRIUS 3RW5 generation as the successor family for phased-out 3RW40 units. For the 3RW4076-6BB44, Siemens lists 3RW5076-6AB14 as the preferred successor type. A successor should be treated as a migration choice rather than an automatic one-to-one substitution; motor rating, control supply, wiring, protection and panel arrangement should be checked together.

MATCHING LOGIC

When evaluating a replacement, compare the complete part number, starter size, motor power, rated current, main voltage, control supply, connection arrangement and physical dimensions rather than relying on the family name alone.

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Send the complete part number, quantity, destination and required date. For replacement projects, adding the machine or system context helps us check the appropriate configuration.

Sales Manager: Miya Zheng

Email: sales@amikon.cn

Phone / WhatsApp: +86 180 2077 6792

ORDER CHECKPOINTS

Part Number	Required
Quantity	Required
Destination	Required
Required Date	Recommended
Machine / System	Recommended

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DELIVERY	3–5 Days	WARRANTY	12 Months
PACKAGING	Brand New	PAYMENT	T/T
SHIPPING	E-packing / FedEx / EMS / TNT / DHL / UPS

Returns & Replacement

01	Please contact us within 7 days if you have any question after you receiving the items.
02	The returned items has to be in its original condition, with a specific reason for the return. We will issue a return or replacement for your order after we received the returns.
03	The buyer is responsible for all the shipping cost incurred.

PURCHASE & REPLACEMENT FAQ

Questions worth checking before ordering

01	Can Siemens 3RW4076-6BB44 be selected solely by matching the 250 kW motor rating? No. The 250 kW rating applies to the specified 400 V standard switching arrangement at 40°C. A proper selection also needs the motor operating voltage, motor current, starting duty, ambient temperature, control supply, protective arrangement and panel conditions to be checked together.
02	What should be checked when replacing an installed Siemens 3RW4076-6BB44 with another unit? Check the complete order code, S12 frame, 432 A rating at 40°C, 230 V AC control supply, main voltage range, terminal arrangement, enclosure space, clearances and connected motor circuit. The physical size of the replacement should also be compared with the existing panel arrangement.
03	Why does the 432 A rating of Siemens 3RW4076-6BB44 matter when the panel operates above 40°C? The rated current changes with ambient temperature. The unit is rated at 432 A at 40°C, 385 A at 50°C and 335 A at 60°C. Therefore, a panel operating at a higher ambient temperature should not be evaluated using the 432 A value alone.
04	Is Siemens 3RW4076-6BB44 a direct one-for-one replacement for the newer 3RW5 generation? Siemens identifies the 3RW5 family as the successor generation and lists 3RW5076-6AB14 as the preferred successor type. Because the product generation changes, the receiving circuit, control arrangement, motor application, physical installation and protection design should be checked before a migration is approved.
05	What makes Siemens 3RW4076-6BB44 worth checking by complete part number when sourcing an older spare? This exact execution combines S12 size, 432 A rated current at 40°C, 200–460 V AC operating voltage, 230 V AC control supply and a specific connection arrangement. For an older installation, matching the complete 3RW4076-6BB44 designation helps avoid selecting a visually similar 3RW40 unit with a different electrical rating.

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We have a wide range of brands and products for various industries, we provide services to tens of thousands of customers around the world.

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