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Siemens 3RW5245-2TC04 — Soft Starters

Siemens 3RW5245-2TC04 Soft Starter, 135 A, 200-480 V, SIRIUS

MPN3RW5245-2TC04
Active

Siemens SIRIUS 3RW5245-2TC04 soft starter, 135 A minimum, 200-480 V, Class 10A/10E/20E, PROFIBUS/Modbus RTU/TCP/EtherNet/IP/PROFINET, screw fixing, 393x210x203 mm.

Siemens 3RW5245-2TC04 datasheet (PDF)
StockContact for availability
Lead timeIn Stock wk
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

3RW5245-2TC04 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS

Power & Motor Rating

3RW5245-2TC04 — Power & Motor Rating
ParameterValue
Rated motor power at 400 V (40 °C)160 kW
Rated motor power at 230 V (40 °C)90 kW
Rated operational current at 40 °C546 A
Rated operational current at 50 °C483 A
Rated operational current at 60 °C442 A
Rated insulation voltage600 V
Minimum settable current (% of Ie)15 %; Relative to smallest settable Ie
Power loss during startup (50 °C)4 471 W

Control & Connection

3RW5245-2TC04 — 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

3RW5245-2TC04 — 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

3RW5245-2TC04 — Mechanical
ParameterValue
Height393 mm
Width210 mm
Depth203 mm
Weight9.9 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

3RW5245-2TC04 — 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

3RW5245-2TC04 — 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

3RW5245-2TC04 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

Ratings that govern the motor start

The 3RW5245-2TC04: Minimum setting current is 135 A, which sets the floor for the motor FLA you can protect — anything below that and the soft starter can't regulate the ramp. The voltage range is 200-480 V, covering common low-voltage industrial supplies from 208 V to 480 V without a tap change. Trip class is selectable: default CLASS 10A, or 10E and 20E per IEC 60947-4-2. For a pump or conveyor start that needs a longer ramp without nuisance tripping, 20E gives you the headroom; for a quick-start fan, 10A keeps the thermal protection tight.

Fieldbus options and control supply

Built-in PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET — this covers the major industrial Ethernet and serial fieldbuses without an add-on module. PROFIenergy support is available when paired with the PROFINET communication module. Control supply is 24 V DC. Remote reset is possible by cycling the control supply voltage. The unit also supports auto-reset and firmware updates.

Mounting and clearances

Screw fixing with a vertical mounting surface; the unit can be rotated ±90° or tilted ±22.5° front-to-back. Required clearances: 100 mm upwards, 10 mm forwards, 0 mm backwards, 75 mm downwards, 5 mm at the sides. Envelope dimensions: 393 mm high, 210 mm wide, 203 mm deep.

Approvals and compliance

CE, UL, and CSA approved. Pollution degree 3 per IEC 60947-4-2. Operating temperature range -25 to +60 °C, with derating required at 40 °C or above. Shock resistance 15 g / 11 ms.

Frequently asked questions

What is the minimum current setting for 3RW5245-2TC04?

The minimum settable current is 135 A. That defines the smallest motor FLA the soft starter can protect.

What voltage range does 3RW5245-2TC04 support?

Rated voltage is 200-480 V, covering 208 V through 480 V industrial supplies.

What fieldbus protocols are built into 3RW5245-2TC04?

PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET are all integrated.

What are the mounting clearances for 3RW5245-2TC04?

Clearances: 100 mm upwards, 10 mm forwards, 0 mm backwards, 75 mm downwards, 5 mm at the sides.

Where can I buy 3RW5245-2TC04 and how is it quoted?

Sourced to order through independent distribution.

MPN
3RW5245-2TC04