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Siemens 3RW4436-6BC36 — Soft Starters

Siemens 3RW4436-6BC36 Soft Starter, 281 A, SIRIUS

MPN3RW4436-6BC36

Siemens SIRIUS 3RW4436-6BC36 soft starter, 281 A at 40 °C, 690 V insulation voltage, 50/60 Hz, thyristor-based, with display and adjustable current limitation.

Siemens 3RW4436-6BC36 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW4436-6BC36 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW4436-6BC36 — 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%
3RW4436-6BC36 — 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%
3RW4436-6BC36 — 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
3RW4436-6BC36 — 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
3RW4436-6BC36 — 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 — real-world ampacity in a warm panel

The 3RW4436-6BC36 is a SIRIUS-brand soft starter rated 281 A at 40 °C ambient.

Thyristor control with inside-delta option

Thyristor-based switching with adjustable current limitation lets you set the start ramp to match the load — useful for conveyors, pumps, or fans that need a controlled acceleration without mechanical shock. Inside-delta wiring is supported, which reduces the current through each thyristor pair by roughly 58% compared to standard in-line connection — a practical option for high-inertia loads where the motor current exceeds the starter's single-phase rating.

Integrated protection and fault display

Built-in motor overload protection and intrinsic device protection eliminate the need for a separate overload relay and external motor thermistor module in many applications — reduces wiring and panel space. A fault-signal display shows the last trip cause, which cuts troubleshooting time on a down line.

Mounting and wiring flexibility

Screw fixing with a vertical mounting surface rotatable ±90° and tiltable ±22.5° gives panel layout options — fits where a fixed orientation won't. The maximum motor cable length is 500 m.

Frequently asked questions

What is the 3RW4436-6BC36 rated current at elevated ambient?

Rated 281 A at 40 °C, derating to 251 A at 50 °C and 217 A at 60 °C. The derating curve is the deciding factor for enclosure placement.

Does the 3RW4436-6BC36 support inside-delta wiring?

Yes, inside-delta circuit connection is supported, which reduces the current through each thyristor pair and is often used for high-inertia loads.

MPN
3RW4436-6BC36