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Siemens 3RW4436-6BC34 — Soft Starters

Siemens 3RW4436-6BC34 SIRIUS Soft Starter, 281 A at 40 °C

MPN3RW4436-6BC34

Siemens SIRIUS 3RW4436-6BC34 soft starter, 281 A at 40 °C, 690 V insulation voltage, thyristor-based, adjustable current limitation, screw fixing, 270 mm depth.

Siemens 3RW4436-6BC34 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW4436-6BC34 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW4436-6BC34 — Power & Motor Rating
ParameterValue
Rated operational current at 40 °C281A
Rated operational current at 50 °C251A
Rated operational current at 60 °C217A
Rated insulation voltage690V
Minimum settable current (% of Ie)8%
3RW4436-6BC34 — Control & Connection
ParameterValue
Control supply voltage typeAC
Rated voltage at 50 Hz115V
Rated voltage at 60 Hz115V
Main circuit terminal typebusbar connection
Auxiliary contact rating (UL)B300 / R300
Control supply voltage tolerance, AC 50 Hz (max.)10%
Control supply voltage tolerance, AC 50 Hz (min.)-15%
Control supply voltage tolerance, AC 60 Hz (max.)10%
Control supply voltage tolerance, AC 60 Hz (min.)-15%
Control supply frequency tolerance (max.)10%
Control supply frequency tolerance (min.)-10%
Operating frequency tolerance (max.)10%
Operating frequency tolerance (min.)-10%
Operating voltage tolerance, inside-delta (max.)10%
Operating voltage tolerance, inside-delta (min.)-15%
3RW4436-6BC34 — Protection & Features
ParameterValue
Motor overload protectionYes
Thermistor motor protectionYes
Adjustable current limitationYes
Inside-delta connectionYes
Intrinsic device protectionYes
Pollution degree3, acc. to IEC 60947-4-2
3RW4436-6BC34 — Mechanical
ParameterValue
Height200mm
Width170mm
Depth270mm
Mounting positionwith vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back
Fastening methodscrew fixing
Mounting clearance, top100mm
Mounting clearance, bottom75mm
Mounting clearance, side5mm
3RW4436-6BC34 — Environmental
ParameterValue
Operating temperature range60°C
Ambient class during operation (IEC 60721)3K6 (no formation of ice, no condensation), 3C3 (no salt mist), 3S2 (sand must not get into the devices), 3M6
Ambient class during transport (IEC 60721)2K2, 2C1, 2S1, 2M2 (max. fall height 0.3 m)

Product details

281 A at 40 °C — the motor current ceiling

The 3RW4436-6BC34: For a 250 A motor in a 50 °C panel, this unit holds the margin; above that, step up a frame. Insulation voltage rated 690 V, operating frequency 50 to 60 Hz at 115 V control voltage — the control transformer and line reactor must match the 115 V coil tap.

Thyristor ramp with adjustable current limit

Thyristor-based switching with adjustable current limitation — set the start ramp ceiling below the motor locked-rotor current to limit inrush on the supply transformer. Minimum load 8 % of rated current means it can soft-start a lightly loaded conveyor without dropping out. Motor overload protection and intrinsic device protection are built in — the display shows fault codes for diagnostics without a separate HMI.

Panel fit and power wiring

Depth 270 mm, width 170 mm, height 200 mm — screw fixing to a vertical mounting surface, rotatable ±90° or tiltable ±22.5° front-to-back. Clearance: 100 mm above, 75 mm below, 5 mm at the sides for airflow. Maximum motor cable length 500 m — keep the run within that to avoid reflected-wave stress on the thyristors.

Frequently asked questions

Where can I buy 3RW4436-6BC34 and get a price?

Submit an RFQ for current pricing and lead time.

What is the depth of 3RW4436-6BC34?

270 mm depth, 170 mm width, 200 mm height. Screw fixing with 100 mm clearance above and 75 mm below.

What wire sizes does the power terminal accept?

Stranded 25 to 120 mm² or busbar connection.

MPN
3RW4436-6BC34