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Siemens 3RW5235-6AC15 — Soft Starters

Siemens 3RW5235-6AC15 SIRIUS Soft Starter, 68 A

MPN3RW5235-6AC15
Active

Siemens SIRIUS 3RW5235-6AC15 soft starter, 68 A minimum setting, trip class 10A/10E/20E per IEC 60947-4-2, multi-protocol fieldbus, 200–600 V, screw fixing, 203 x 185 x 306 mm.

Siemens 3RW5235-6AC15 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW5235-6AC15 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW5235-6AC15 — 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
3RW5235-6AC15 — Control & Connection
ParameterValue
Control supply voltage typeAC
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 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 %
3RW5235-6AC15 — 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
3RW5235-6AC15 — 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
3RW5235-6AC15 — 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)
3RW5235-6AC15 — 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
3RW5235-6AC15 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

Sizing and Trip Class

The 3RW5235-6AC15 is a SIRIUS soft starter with a minimum settable motor current of 68 A, relative to the smallest settable Ie. The trip class defaults to CLASS 10A per IEC 60947-4-2, with selectable 10E or 20E — meaning it can be configured for standard (10A), electronic (10E), or extended (20E) overload protection curves. This lets you match the protection to the motor's starting profile: 10A for normal starts, 20E for high-inertia loads like fans or centrifuges. Rated operating voltage spans 200 to 600 V, covering common low-voltage motor supplies across 50/60 Hz networks.

Fieldbus and Control Integration

This soft starter supports PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET — five fieldbus protocols on one device. PROFINET includes PROFIenergy capability when paired with the standard communication module. The analog output is factory-set to 4–20 mA but can be parameterized to 0–10 V via the High Feature HMI. Remote reset is achieved by cycling the control supply voltage.

Mounting and Environmental Clearances

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

Frequently asked questions

What is the trip class of Siemens 3RW5235-6AC15?

The default trip class is CLASS 10A per IEC 60947-4-2, with selectable 10E or 20E. This allows matching overload protection to the motor starting profile.

Can Siemens 3RW5235-6AC15 be used with PROFIBUS?

Yes, it supports PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET — five fieldbus protocols on one device.

Where can I buy Siemens 3RW5235-6AC15?

This part is sourced to order; availability and pricing are confirmed at quote time.

MPN
3RW5235-6AC15