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Siemens 3RW5235-6TC04 — Soft Starters

Siemens 3RW5235-6TC04 SIRIUS Soft Starter, 68 A, 200-480 V

MPN3RW5235-6TC04
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Siemens SIRIUS 3RW5235-6TC04 soft starter, 68 A minimum, 200-480 VAC, Trip Class 10A/10E/20E, multi-protocol communications, screw fixing.

Siemens 3RW5235-6TC04 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW5235-6TC04 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW5235-6TC04 — Power & Motor Rating
ParameterValue
Rated motor power at 400 V (40 °C)75 kW
Rated motor power at 230 V (40 °C)37 kW
Rated operational current at 40 °C248 A
Rated operational current at 50 °C222 A
Rated operational current at 60 °C204 A
Rated insulation voltage600 V
Minimum settable current (% of Ie)15 %; Relative to smallest settable Ie
Power loss during startup (50 °C)1 807 W
3RW5235-6TC04 — 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, solid1x (0.5 ... 4.0 mm²), 2x (0.5 ... 2.5 mm²)
Control circuit wire range, finely stranded (with ferrule)1x (0.5 ... 2.5 mm²), 2x (0.5 ... 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 %
3RW5235-6TC04 — 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
3RW5235-6TC04 — Mechanical
ParameterValue
Height306 mm
Width185 mm
Depth203 mm
Weight6.6 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
3RW5235-6TC04 — 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)
3RW5235-6TC04 — 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
3RW5235-6TC04 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

What this soft starter does for a motor line

The Siemens 3RW5235-6TC04 is a SIRIUS-series soft starter rated for a minimum motor current of 68 A across a 200 to 480 VAC supply. It's built for three-phase induction motors where you need controlled acceleration and deceleration — pump ramp-down is built in — and the Trip Class is selectable between CLASS 10A (default), 10E, or 20E per IEC 60947-4-2, so you match the thermal model to your motor's start profile. This unit communicates over PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET, with PROFIenergy support when paired with the PROFINET communication module. That makes it a drop-in for most plant-floor networks without an extra gateway.

Mounting and clearances — panel layout matters

The 3RW5235-6TC04 measures 306 mm high, 185 mm wide, and 203 mm deep. It mounts with screw fixing on a vertical surface, rotatable ±90° or 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 — tight on the backplane, but plan for airflow above and below.

Frequently asked questions

Does the 3RW5235-6TC04 support PROFIBUS or Modbus communication?

Yes, it supports PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET, with PROFIenergy available via the PROFINET communication module.

What is the trip class of the 3RW5235-6TC04 soft starter?

Trip Class is selectable: CLASS 10A (default), 10E, or 20E, per IEC 60947-4-2.

MPN
3RW5235-6TC04