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Siemens 3RW5235-2TC04 — Soft Starters

Siemens 3RW5235-2TC04 SIRIUS Soft Starter, 68 A, 200-480 V

MPN3RW5235-2TC04
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Siemens SIRIUS 3RW5235-2TC04 soft starter, 68 A min setting, 200–480 V, Trip Class 10A/10E/20E, PROFIBUS/Modbus/EtherNet/IP.

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MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

3RW5235-2TC04 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS

Power & Motor Rating

3RW5235-2TC04 — 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

Control & Connection

3RW5235-2TC04 — 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 %

Protection & Features

3RW5235-2TC04 — 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

Mechanical

3RW5235-2TC04 — 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

Environmental

3RW5235-2TC04 — 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)

Specifications

3RW5235-2TC04 — 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

Electrical

3RW5235-2TC04 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

The Siemens 3RW5235-2TC04 is a SIRIUS soft starter rated for a minimum motor current setting of 68 A, with the voltage range covering 200 to 480 V AC — common for low-voltage three-phase induction motors in European and North American panels. Trip Class defaults to CLASS 10A per IEC 60947-4-2, which means it clears the start within 10 seconds at locked-rotor current; you can also select 10E or 20E for longer acceleration on high-inertia loads like centrifuges or large fans. Fieldbus support includes PROFIBUS, Modbus RTU, Modbus TCP, and EtherNet/IP, plus PROFINET standard and PROFIenergy for coordinated energy management during idle phases. This makes the unit a drop-in for multi-vendor automation architectures without a separate gateway.

Panel layout and mounting clearances

The unit measures 306 mm high, 185 mm wide, and 203 mm deep, with screw fixing on a vertical mounting surface. Minimum clearances around the body: 100 mm upwards, 10 mm forwards, 0 mm backwards, 75 mm downwards, and 5 mm at the sides — essential to lay out before cutting the backplate.

This is a current-catalog SIRIUS soft starter, not an obsolete or NRND line.

Frequently asked questions

What trip classes does the 3RW5235-2TC04 support?

It supports Trip Class 10A (default), 10E, and 20E per IEC 60947-4-2, allowing you to match the start profile to the load inertia.

What fieldbus protocols does the 3RW5235-2TC04 support?

It supports PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET, plus PROFIenergy for energy management.

MPN
3RW5235-2TC04