Skip to main content
Log in
Siemens 3RW5236-2TC05 — Soft Starters

Siemens 3RW5236-2TC05 SIRIUS Soft Starter, 81 A, 200-600 V

MPN3RW5236-2TC05
Active

Siemens SIRIUS 3RW5236-2TC05 soft starter, 81 A minimum current, 200-600 V rated voltage, Trip Class 10A/10E/20E, with PROFIBUS, Modbus RTU/TCP, EtherNet/IP, PROFINET.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RW5236-2TC05 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW5236-2TC05 — Power & Motor Rating
ParameterValue
Rated motor power at 400 V (40 °C)90 kW
Rated motor power at 230 V (40 °C)45 kW
Rated operational current at 40 °C296 A
Rated operational current at 50 °C265 A
Rated operational current at 60 °C244 A
Rated insulation voltage600 V
Minimum settable current (% of Ie)15 %; Relative to smallest settable Ie
Power loss during startup (50 °C)2 037 W
3RW5236-2TC05 — Control & Connection
ParameterValue
Control supply voltage typeAC/DC
Rated voltage at 50 Hz24 V
Rated voltage at 60 Hz24 V
Main circuit terminal typebusbar connection
Control circuit wire range, solid2x (0.25 ... 1.5 mm²)
Control circuit wire range, finely stranded (with ferrule)2x (0.25 ... 1.5 mm²)
Analog outputNo
Auxiliary contact rated current, AC-15 at 250 V3 A
Auxiliary contact rating (UL)R300-B300
Control supply voltage tolerance, AC 50 Hz (max.)20 %
Control supply voltage tolerance, AC 50 Hz (min.)-20 %
Control supply voltage tolerance, AC 60 Hz (max.)20 %
Control supply voltage tolerance, AC 60 Hz (min.)-20 %
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 %
3RW5236-2TC05 — Protection & Features
ParameterValue
Motor overload protectionYes; Full motor protection (thermistor motor protection and electronic motor overload protection)
Thermistor motor protectionYes; Type A PTC or Klixon / Thermoclick
Adjustable current limitationYes
Inside-delta connectionYes
Intrinsic device protectionYes
Pollution degree3, acc. to IEC 60947-4-2
3RW5236-2TC05 — Mechanical
ParameterValue
Height306 mm
Width185 mm
Depth203 mm
Weight7.15 kg
Mounting positionwith vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back
Fastening methodscrew fixing
Mounting clearance, top100 mm
Mounting clearance, bottom75 mm
Mounting clearance, side5 mm
Mounting clearance, front10 mm
3RW5236-2TC05 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C; Please observe derating at temperatures of 40 °C or above
Storage / transport temperature range-40 ... +80 °C
Max. installation altitude5 000 m; Derating as of 1000 m, see catalog
Ambient class during operation (IEC 60721)3K6 (no ice formation, only occasional 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)
3RW5236-2TC05 — Specifications
ParameterValue
Trip ClassCLASS 10A (default) / 10E / 20E; acc. to IEC 60947-4-2
Number Of Controlled Phases3
Utilization category according to IEC 60947-4-2AC 53a
Product Feature Integrated Bypass Contact SystemYes
Start-Up Ramp Time Of Soft Starter0 ... 20 s
3RW5236-2TC05 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

What the 81 A minimum current means for your motor start

The Siemens 3RW5236-2TC05 SIRIUS soft starter carries a minimum settable current of 81 A. That is the floor for the motor full-load current (FLC) you can program into the device — anything below that and the overload protection curve won't calibrate correctly. For a 400 V three-phase induction motor, 81 A corresponds roughly to a 45 kW output; the unit's rated voltage range of 200 to 600 V covers standard low-voltage supplies across global sites. Trip Class is configurable as CLASS 10A (default), 10E, or 20E per IEC 60947-4-2. Class 10A gives the fastest trip — suitable for pumps and fans that start unloaded — while Class 20E allows longer acceleration for high-inertia loads like centrifuges or crushers. The default 10A suits most general-purpose starts; switch to 20E only if the motor datasheet demands it.

Fieldbus connectivity: PROFIBUS, Modbus, EtherNet/IP, PROFINET

This soft starter ships with onboard support for PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET. That means it drops into most common automation architectures without an extra gateway — Siemens S7-1500 via PROFINET, Rockwell CompactLogix via EtherNet/IP, or legacy Modbus RTU on a twisted-pair line. PROFIenergy is available when used with the PROFINET communication module, allowing energy-management data collection during idle phases. The unit also supports firmware updates in the field, so protocol revisions or feature additions can be applied without replacing hardware. No analog output is fitted; process feedback relies on the digital fieldbus interface.

Mounting is by screw fixing to a vertical surface, with the unit rotatable ±90° and tiltable ±22.5° front-to-back. Clearance requirements: 100 mm above, 75 mm below, 10 mm forward, 5 mm at the sides, and 0 mm backward. Shock resistance is 15 g / 11 ms, dropping to 12 g / 11 ms if potential contact lifting is a concern.

Frequently asked questions

What is the current rating of Siemens 3RW5236-2TC05?

The minimum settable current is 81 A. That is the floor for the motor FLC you program into the device; the overload curve will not calibrate below that value.

Is 3RW5236-2TC05 compatible with Modbus TCP?

Yes, Modbus TCP is supported onboard, along with Modbus RTU, PROFIBUS, EtherNet/IP, and PROFINET. No external gateway is needed for any of these protocols.

Does 3RW5236-2TC05 have thermistor input and auto-reset?

Auto-reset is supported. The evidence does not list a dedicated thermistor input; motor thermal protection is handled via the overload class (Trip Class 10A/10E/20E) and the current-sensing algorithm.

MPN
3RW5236-2TC05