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Siemens 3RW5234-2TC04 — Soft Starters

Siemens 3RW5234-2TC04 SIRIUS Soft Starter, 200-480 V

MPN3RW5234-2TC04
Active

Siemens SIRIUS 3RW5234-2TC04 soft starter, 200-480 V, 53 A minimum, Class 10A/10E/20E, screw fixing, 306 x 185 x 203 mm.

Siemens 3RW5234-2TC04 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW5234-2TC04 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW5234-2TC04 — 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
3RW5234-2TC04 — 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 %
3RW5234-2TC04 — 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
3RW5234-2TC04 — 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
3RW5234-2TC04 — 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)
3RW5234-2TC04 — 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
3RW5234-2TC04 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

What this SIRIUS soft starter does that a contactor can't

The Siemens 3RW5234-2TC04 is a SIRIUS hybrid switching device — a soft starter, not a plain contactor. It ramps motor voltage up on start and down on stop, cutting the mechanical shock and current spike that a direct-on-line contactor slams into the load. Rated for a minimum load of 53 A at 200-480 V, it covers the sweet spot for medium motors — pumps, conveyors, fans — where you need controlled acceleration, not just an on-off switch. Trip class is configurable: default Class 10A, with options for 10E or 20E per IEC 60947-4-2. That means it can handle a 10-second or 20-second overload profile without nuisance tripping, depending on the motor's start-up draw.

Fieldbus and control — what talks to the PLC

This soft starter ships with onboard PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET standard — you don't need a separate communication module for most networks. PROFIenergy is supported when used with the PROFINET standard communication module. Control supply is 24 V DC. The unit supports remote reset by cycling the control supply voltage, plus automatic reset. No analog output on this variant. Firmware updates are possible in the field — useful if you're standardizing on a later parameter set across a line.

Mounting and panel fit — clearance counts

Screw fixing to the back panel, not DIN rail. Dimensions are 306 mm high, 185 mm wide, 203 mm deep — plan the gland plate and door clearance accordingly. Mounting position is flexible: vertical surface with +/-90° rotation, and +/-22.5° tilt forward/back. That helps when the panel layout is tight. Clearance requirements: 100 mm above, 75 mm below, 10 mm forward, 5 mm to the side, 0 mm backward. Side clearance is tight — adjacent devices can sit close, but the top and bottom need room for airflow and cable bend radius.

Environmental limits and approvals

Pollution degree 3 per IEC 60947-4-2 — suitable for industrial environments with conductive dust or condensation. Shock resistance is 15 g for 11 ms, with potential contact lifting above 12 g. That's typical for industrial panel mounting on a machine base. Approvals: UL, CSA, CE marking all present. Service factor is 1.0 — no built-in overload margin beyond the trip class setting.

Frequently asked questions

What compliance documentation does Siemens provide for 3RW5234-2TC04?

The unit carries UL approval, CSA approval, and CE marking. Pollution degree 3 per IEC 60947-4-2 is specified. Service factor is 1.0.

What are the key ratings of the 3RW5234-2TC04?

Minimum load current is 53 A at 200-480 V. Trip class is configurable: default Class 10A, with 10E or 20E options per IEC 60947-4-2. Control supply is 24 V DC. Operating ambient -25 to +60 °C with derating above 40 °C.

What fieldbus protocols does the 3RW5234-2TC04 support?

Onboard PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET standard. PROFIenergy is supported with the PROFINET communication module.

MPN
3RW5234-2TC04