3RW4076-6BB44
3RW4076-6BB44
3RW4076-6BB44
3RW4076-6BB44
3RW4076-6BB44
3RW4076-6BB44
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    Discontinued / Obsolete by OEM
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3RW4076-6BB44

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Siemens 3RW4076-6BB44 is a SIRIUS 3RW40 S12 soft starter that limits starting current and controls the acceleration of three-phase motors.
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Technical specifications for 3RW4076-6BB44

  • Manufacturer:
    Siemens
  • Part Number:
    3RW4076-6BB44
  • Product Family:
    Siemens Drives & Motion Control
  • Product Type:
    S12 Soft Starter
  • Stock:
    1
  • Starter Size:
    S12
  • Rated Operational Current at 40 °C:
    432 A
  • Rated Operational Current at 50 °C:
    385 A
  • Rated Operational Current at 60 °C:
    335 A
  • Operating Voltage:
    200 to 460 V AC
  • Control Supply:
    230 V AC
  • Rated Frequency:
    50 to 60 Hz
  • Motor Power at 400 V:
    250 kW
  • Motor Power at 230 V:
    132 kW
  • Minimum Motor Current Setting:
    207 A
  • Minimum Load:
    20%
  • Continuous Current at 40 °C:
    115% of Ie
  • Typical Power Loss:
    165 W
  • Integrated Bypass:
    Yes
  • Motor Overload Protection:
    Yes
  • Adjustable Current Limitation:
    Yes
  • Main-Circuit Connection:
    Busbar
  • Control-Circuit Connection:
    Screw terminals
  • Maximum Motor Cable Length:
    300 m
  • Operating Temperature:
    -25 to 60 °C
  • Storage Temperature:
    -40 to 80 °C
  • Degree of Protection:
    IP00
  • Weight:
    19.418 lbs (8.808 kg)
  • Estimated shipping dimensions:
    32.1x34.1x22.1cm
  • Tariff Code:
    85371098
  • Country of origin:
    Czech Republic
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Starting Control Power Circuits Protection Installation

Features:

  • The thyristor stage ramps the three-phase motor voltage during starting.
  • Integrated bypass contacts carry the motor current after the acceleration sequence.
  • Current limiting, overload protection, device protection, and external reset are built into the S12 starter.
Siemens 3RW4076-6BB44 separates its 200–460 V AC motor path from the 230 V AC control-supply path.

The rated current of 3RW4076-6BB44 changes with ambient temperature, so motor selection and enclosure temperature must be evaluated together.

Busbar power connections and screw-type control terminals give 3RW4076-6BB44 different conductor requirements on the two circuit sides.

The Siemens 3RW4076-6BB44 SIRIUS 3RW40 S12 Soft Starter may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 3RW4076-6BB44 SIRIUS 3RW40 S12 Soft Starter Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

Motor Acceleration and Bypass

  • Voltage ramp: The thyristor stage progressively raises the motor voltage during the configured start sequence.
  • Current limit: The adjustable current limit constrains the starting current when the motor and load data are correctly selected.
  • Bypass transfer: Integrated contacts take over the running current after acceleration, reducing sustained thyristor losses.
  • Motor selection: Motor voltage, rated current, duty, and load profile must remain within the starter selection data.

Motor and Control-Supply Paths

  • Main circuit: Three busbar-connected poles carry the 200 to 460 V AC motor supply.
  • Control supply: A separate 230 V AC source powers the starter electronics at 50 or 60 Hz.
  • Auxiliary contacts: Two normally open and one changeover contact report the documented operating states.
  • Cable reach: The motor connection is specified for a maximum cable length of 300 m.

Current and Device Protection

  • Motor setting: Electronic overload protection uses a motor-current setting that starts at 207 A.
  • Device protection: Intrinsic protection supervises the starter power electronics independently of the motor-overload function.
  • External reset: A remote reset input allows a latched fault to be cleared from the control circuit.
  • Temperature derating: The operational-current rating falls from 432 A at 40 °C to 335 A at 60 °C.

S12 Mounting and Clearances

  • Fixing method: The S12 housing attaches to the mounting surface with screws.
  • Vertical clearance: The installation requires 100 mm above and 75 mm below the starter.
  • Side clearance: Adjacent equipment must leave at least 5 mm at the side.
  • Orientation: Permitted rotation and tilt depend on whether the additional fan is installed.
Description
Siemens 3RW4076-6BB44 is a SIRIUS 3RW40 S12 soft starter for controlling the acceleration of three-phase motors. Its thyristor power stage raises the applied motor voltage during starting, while the integrated bypass contact system carries the running current after the start sequence.

The main circuit of 3RW4076-6BB44 accepts 200 to 460 V AC and uses busbar connections for the three power poles. A separate 230 V AC control supply powers the starter logic, so the motor circuit and control circuit must be checked independently during replacement or commissioning.

Motor-overload protection, intrinsic device protection, adjustable current limiting, and external reset are combined inside 3RW4076-6BB44. The motor current setting begins at 207 A, while the permitted operational current decreases as ambient temperature rises from 40 °C to 60 °C.

Cabinet installation of 3RW4076-6BB44 requires the documented clearances above, below, and beside the S12 housing. The vertical mounting surface, optional fan arrangement, conductor cross-section, and maximum motor-cable length all affect how the starter can be integrated into the power circuit.
Alternative Names
3RW40766BB44 3RW4076 6BB44 3RW 4076 6BB44 Siemens 3RW4076-6BB44 3RW4076-6BB44 SIRIUS Soft Starter 3RW4O76-6BB44 3RW4076-68844 Siemens SIRIUS 3RW4076 6BB44
Technical notes
Integrated bypass contacts allow Siemens 3RW4076-6BB44 to transfer the motor current away from the thyristor path after acceleration.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why can 3RW4076-6BB44 trip before the motor reaches full speed?
Check whether the 3RW4076-6BB44 current limit, motor-current setting, starting time, load inertia, and allowed starts per hour match the connected motor.
What must be separated when wiring 3RW4076-6BB44?
The 3RW4076-6BB44 main poles carry the 200–460 V AC motor circuit, while the control terminals require a separate 230 V AC supply.
How does ambient temperature affect 3RW4076-6BB44 selection?
Siemens rates 3RW4076-6BB44 at 432 A at 40 °C, 385 A at 50 °C, and 335 A at 60 °C, so the cabinet temperature changes the usable current rating.
Why should the bypass state be checked on 3RW4076-6BB44?
If the 3RW4076-6BB44 bypass contacts do not close after acceleration, the thyristors continue carrying current and the starter power loss rises.
Which connections require different conductor planning on 3RW4076-6BB44?
The 3RW4076-6BB44 uses busbar main-circuit connections and screw-type auxiliary/control terminals, so each side has a different conductor range.
What cabinet space is required around 3RW4076-6BB44?
Allow 100 mm above, 75 mm below, and 5 mm at the side of 3RW4076-6BB44 while observing the permitted mounting orientation.