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Siemens 3RW5055-2AB05 — Soft Starters

Siemens 3RW5055-2AB05 Soft Starter, 68 A, 200-600 V, ATEX

MPN3RW5055-2AB05
Active

Siemens 3RW5055-2AB05 soft starter, hybrid switching device, 68 A minimum, 200-600 V rated, ATEX, UKEX, IECEx, PROFIBUS, Modbus RTU/TCP, EtherNet/IP, PROFINET.

Siemens 3RW5055-2AB05 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW5055-2AB05 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW5055-2AB05 — 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 °C143 A
Rated operational current at 50 °C128 A
Rated operational current at 60 °C118 A
Rated insulation voltage600 V
Minimum settable current (% of Ie)15 %; Relative to smallest settable Ie
Power loss during startup (50 °C)1 134 W
3RW5055-2AB05 — 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
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 %
3RW5055-2AB05 — Protection & Features
ParameterValue
Motor overload protectionYes; Electronic motor overload protection
Thermistor motor protectionNo
Adjustable current limitationYes
Intrinsic device protectionYes
Pollution degree3, acc. to IEC 60947-4-2
3RW5055-2AB05 — Mechanical
ParameterValue
Height198 mm
Width120 mm
Depth249 mm
Weight3.2 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
3RW5055-2AB05 — 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 Manual
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)
3RW5055-2AB05 — Specifications
ParameterValue
Trip ClassCLASS 10A / 10E (preset) / 20E; acc. to IEC 60947-4-2
Number Of Controlled Phases2
Utilization category according to IEC 60947-4-2AC-53a
Product Feature Integrated Bypass Contact SystemYes
Start-Up Ramp Time Of Soft Starter0 ... 20 s
Ramp-Down Time Of Soft Starter0 ... 20 s
3RW5055-2AB05 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

What the 68 A minimum and trip class mean for your motor start

The 3RW5055-2AB05 is a hybrid switching device — a soft starter — with a minimum settable current of 68 A, meaning it is sized for motor FLCs at or above that floor; below 68 A the overload protection cannot be calibrated down far enough to protect the motor. Trip class is selectable as CLASS 10A, 10E (preset), or 20E per IEC 60947-4-2 — this controls the maximum allowable start time before the overload trips. Class 10A suits high-inertia loads like centrifuges; Class 20E gives extra headroom for long acceleration ramps on conveyors or crushers. Rated operating voltage is 200 to 600 V, covering common global low-voltage motor supplies from 208 V to 600 V without a tap change.

ATEX, UKEX, IECEx — what the approvals cover

This soft starter carries ATEX, UKEX, and IECEx certification — meaning it is approved for use in potentially explosive atmospheres as part of a motor-starting assembly, provided the rest of the installation (cable glands, enclosure, motor) also meets the zone requirements. UL and CSA approval, plus CE marking, round out the compliance set for North American and European installations — the part ships with the documentation needed for a panel builder's declaration of conformity.

Fieldbus integration — PROFIBUS, Modbus, EtherNet/IP, PROFINET

The 3RW5055-2AB05 supports PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET standard — the communication module is integrated, so no separate gateway is needed for most PLC networks. PROFIenergy is available in conjunction with the PROFINET standard communication module — this allows the soft starter to participate in energy-management profiles during production pauses.

Mounting and environmental limits for panel integration

Fastening is by screw fixing — not DIN-rail snap-on — so plan for four mounting points on the panel backplate. Dimensions are 120 mm wide, 198 mm high, 249 mm deep. Mounting position allows a vertical mounting surface with +/-90° rotation and +/-22.5° tilt forward/back — useful when the panel layout forces an off-axis orientation. Shock resistance is 15 g / 11 ms, with potential contact lifting starting at 12 g / 11 ms — relevant for installations on vibrating machinery or in mobile equipment.

Frequently asked questions

What compliance documentation does this brand provide for 3RW5055-2AB05?

The 3RW5055-2AB05 carries ATEX, UKEX, IECEx, UL, CSA, and CE marking. These certifications cover explosive atmospheres, North American safety, and European conformity. The manufacturer provides the relevant declarations and certificates with the shipment.

MPN
3RW5055-2AB05