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Siemens 3RW5245-2AC05 — Soft Starters

Siemens 3RW5245-2AC05 SIRIUS Soft Starter, 135 A, 200-600 V

MPN3RW5245-2AC05
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Siemens SIRIUS 3RW5245-2AC05 soft starter, rated 135 A minimum, 200-600 V operating voltage, Trip Class 10A default, multi-protocol fieldbus, 393 x 210 x 203 mm.

Siemens 3RW5245-2AC05 datasheet (PDF)
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Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

3RW5245-2AC05 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS

Power & Motor Rating

3RW5245-2AC05 — 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

3RW5245-2AC05 — 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 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.)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

3RW5245-2AC05 — 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

3RW5245-2AC05 — 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

3RW5245-2AC05 — 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

3RW5245-2AC05 — 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

3RW5245-2AC05 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

What this soft starter does on the line

The Siemens SIRIUS 3RW5245-2AC05 is a hybrid switching device — a soft starter — for motor starting duty. Its minimum rated current is 135 A; the operating voltage range is 200 to 600 V. Trip Class 10A is the default. It ships with soft torque and pump ramp down profiles built in, which is the difference between a gentle start on a centrifugal pump and a pressure spike that bursts a gasket. No external bypass contactor is integrated — the soft starter handles the start sequence, and you add a bypass contactor externally if continuous full-voltage running is needed.

Fieldbus and control — what talks to the PLC

This unit speaks PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET standard. That means it drops into almost any automation network without a separate gateway — Siemens S7, Rockwell ControlLogix, Modicon, or a third-party controller over open Ethernet. PROFINET with PROFIenergy is supported when paired with the PROFINET standard communication module. The analog output is configurable as 4-20 mA or 0-10 V, giving the PLC a real-time current or torque signal for monitoring or closed-loop control. Remote reset is done by cycling the 24 V control supply — no need to walk to the panel for a manual pushbutton.

Frequently asked questions

Does 3RW5245-2AC05 have a built-in bypass contactor?

No, the 3RW5245-2AC05 does not include an internal bypass contactor. You add an external bypass contactor if continuous full-voltage running is required after the start ramp completes.

What communication interfaces does 3RW5245-2AC05 support?

It supports PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET standard — covering most industrial automation networks without an external gateway.

MPN
3RW5245-2AC05