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Siemens 3RW5235-2AC15 — Soft Starters

Siemens 3RW5235-2AC15 SIRIUS Soft Starter, 68 A, 200-600 V

MPN3RW5235-2AC15
Active

Siemens SIRIUS 3RW5235-2AC15 soft starter, 68 A minimum, 200-600 V, Class 10A/10E/20E, PROFIBUS, Modbus RTU/TCP, EtherNet/IP, PROFINET, screw fixing, 306 x 185 x 203 mm.

Siemens 3RW5235-2AC15 datasheet (PDF)
StockContact for availability
Lead time3-5 Days wk
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

3RW5235-2AC15 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS

Power & Motor Rating

3RW5235-2AC15 — 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

3RW5235-2AC15 — Control & Connection
ParameterValue
Control supply voltage typeAC
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 outputYes; 4 ... 20 mA (default) / 0 ... 10 V (parameterizable with High Feature HMI)
Auxiliary contact rated current, AC-15 at 250 V3 A
Auxiliary contact rating (UL)R300-B300
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 %

Protection & Features

3RW5235-2AC15 — Protection & Features
ParameterValue
Motor overload protectionYes; Electronic motor overload protection
Thermistor motor protectionNo
Adjustable current limitationYes
Inside-delta connectionYes
Intrinsic device protectionYes
Pollution degree3, acc. to IEC 60947-4-2

Mechanical

3RW5235-2AC15 — 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

3RW5235-2AC15 — 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

3RW5235-2AC15 — 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

3RW5235-2AC15 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

Sizing and trip class for motor starting

The 3RW5235-2AC15: Trip class is selectable as CLASS 10A (default), 10E, or 20E per IEC 60947-4-2, which governs the allowable motor start time before the overload protection trips — CLASS 10A suits standard starts under 10 seconds, while 20E accommodates higher-inertia loads like centrifuges or crushers.

Fieldbus and control integration

Onboard communications include PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET, with PROFIenergy support for coordinated energy management during idle phases. The analog output is configurable as 4-20 mA (default) or 0-10 V via the High Feature HMI, and a firmware update function is available for field upgrades. Remote reset is possible by cycling the control supply voltage, and auto-reset is supported for unattended restart after a fault clears.

Mounting and environmental limits

The unit is screw-fixed and measures 306 mm high by 185 mm wide by 203 mm deep, with a vertical mounting surface that allows ±90° rotation and ±22.5° tilt front-to-back. Clearance requirements: 100 mm above, 75 mm below, 10 mm forward, 5 mm at the sides, and 0 mm backward — plan the enclosure layout accordingly to avoid derating.

Carries CE, UL, and CSA approvals, covering the primary regulatory jurisdictions for industrial control panels in North America and Europe.

Frequently asked questions

Where can I buy the 3RW5235-2AC15 and get a price?

Submit a quote request for current pricing and availability.

What compliance documentation does Siemens provide for the 3RW5235-2AC15?

The unit carries CE, UL, and CSA approvals — documentation covering RoHS, REACH, and the relevant IEC/UL standards is available from Siemens.

MPN
3RW5235-2AC15