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Siemens 3RW5234-2TC14 — Soft Starters

Siemens 3RW5234-2TC14 SIRIUS Soft Starter, 200-480 V

MPN3RW5234-2TC14
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Siemens SIRIUS 3RW5234-2TC14 soft starter, 200-480 V, 53 A minimum, 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

3RW5234-2TC14 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW5234-2TC14 — Power & Motor Rating
ParameterValue
Rated motor power at 400 V (40 °C)55 kW
Rated motor power at 230 V (40 °C)30 kW
Rated operational current at 40 °C196 A
Rated operational current at 50 °C175 A
Rated operational current at 60 °C154 A
Rated insulation voltage600 V
Minimum settable current (% of Ie)15 %; Relative to smallest settable Ie
Power loss during startup (50 °C)1 291 W
3RW5234-2TC14 — 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 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.)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 %
3RW5234-2TC14 — 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
3RW5234-2TC14 — 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
3RW5234-2TC14 — 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)
3RW5234-2TC14 — 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
3RW5234-2TC14 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

Trip Class and Motor Protection

The Siemens 3RW5234-2TC14 SIRIUS soft starter is a hybrid switching device rated for motor starting duty with a trip class of CLASS 10A (default), 10E, or 20E, per IEC 60947-4-2. This means it can handle a 10-second overload at 7x rated current without tripping — typical for standard induction motor starts on pump, fan, or conveyor loads. The 10E and 20E settings extend the thermal memory for longer acceleration times, useful for high-inertia loads like centrifuges or crushers.

Voltage Range and Current Floor

The unit operates on a rated voltage of 200 to 480 V AC. The minimum settable motor current is 53 A.

Fieldbus and Control Integration

This soft starter ships with onboard support for PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET standard. That means it can drop into a controller over PROFINET, an Allen-Bradley CompactLogix over EtherNet/IP, or a legacy Modbus RTU network without an external gateway. The PROFINET interface also supports PROFIenergy, allowing the drive to signal its power state during idle periods for coordinated energy management.

Mounting is screw-fixing on a vertical surface, with the enclosure rotatable ±90° and tiltable ±22.5° front-to-back. Clearance requirements: 100 mm above, 75 mm below, 10 mm forward, 5 mm to the side, and 0 mm backward — so it can sit flush against a back panel.

Environmental and Approvals

Shock resistance is 15 g for 11 ms, with potential contact lifting above 12 g.

Frequently asked questions

What is the trip class of the 3RW5234-2TC14?

The trip class is CLASS 10A by default, with selectable 10E and 20E settings, per IEC 60947-4-2. CLASS 10A trips after 10 seconds at 7x rated current; 10E and 20E extend the thermal curve for longer acceleration times.

Can the 3RW5234-2TC14 be used with 480V motors?

Yes, the rated voltage range is 200 to 480 V AC, so it directly supports 480 V motors. The minimum settable motor current is 53 A, so size the motor accordingly.

Does the 3RW5234-2TC14 support Modbus TCP?

Yes, it supports Modbus TCP natively, along with Modbus RTU, PROFIBUS, EtherNet/IP, and PROFINET standard.

MPN
3RW5234-2TC14