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Siemens 3RW5056-6AB04 — Soft Starters

Siemens 3RW5056-6AB04 Soft Starter, 81 A, 200-480 V, ATEX

MPN3RW5056-6AB04
Active

Siemens SIRIUS 3RW5056-6AB04 soft starter, 81 A minimum setting, 200-480 V, Trip Class 10A/10E/20E per IEC 60947-4-2, with PROFIBUS, PROFINET, Modbus RTU/TCP, EtherNet/IP, ATEX/UKEX/IECEx approved.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RW5056-6AB04 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW5056-6AB04 — Power & Motor Rating
ParameterValue
Rated motor power at 400 V (40 °C)90 kW
Rated motor power at 230 V (40 °C)45 kW
Rated operational current at 40 °C171 A
Rated operational current at 50 °C153 A
Rated operational current at 60 °C141 A
Rated insulation voltage600 V
Minimum settable current (% of Ie)15 %; Relative to smallest settable Ie
Power loss during startup (50 °C)1 478 W
3RW5056-6AB04 — 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, solid1x (0.5 ... 4.0 mm²), 2x (0.5 ... 2.5 mm²)
Control circuit wire range, finely stranded (with ferrule)1x (0.5 ... 2.5 mm²), 2x (0.5 ... 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 %
3RW5056-6AB04 — 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
3RW5056-6AB04 — Mechanical
ParameterValue
Height198 mm
Width120 mm
Depth249 mm
Weight5.2 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
3RW5056-6AB04 — 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)
3RW5056-6AB04 — 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
3RW5056-6AB04 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

Current setting and trip class — the fit decision

The 3RW5056-6AB04 is a SIRIUS soft starter whose minimum settable current is 81 A, relative to the smallest Ie, per the datasheet. That 81 A floor governs the smallest motor you can protect — anything below that and the overload curve won't calibrate correctly. The trip class is selectable as CLASS 10A, 10E (preset), or 20E per IEC 60947-4-2, so it matches standard motor start profiles: 10A for normal starts, 10E for slightly extended acceleration, 20E for high-inertia loads like centrifuges or large fans. The voltage range is 200 to 480 V, covering common low-voltage three-phase supplies across North America and Europe.

Fieldbus and analog interface

This soft starter ships with onboard support for PROFIBUS, PROFINET standard, Modbus RTU, Modbus TCP, and EtherNet/IP — no separate communication module needed for those protocols. PROFIenergy is available when paired with the PROFINET standard communication module. The analog output is configurable as 4-20 mA (default) or 0-10 V via the High Feature HMI, giving the controls integrator a direct process-variable signal back to the PLC or DCS without an external transducer.

Clearance requirements: 100 mm upward, 75 mm downward, 10 mm forward, 0 mm backward, 5 mm at the sides. Shock resistance is 15 g / 11 ms, dropping to 12 g / 11 ms with potential contact lifting — relevant for mobile or high-vibration installations.

This is an active, current-production Siemens SIRIUS soft starter.

Frequently asked questions

What is the rated current of Siemens 3RW5056-6AB04?

The minimum settable current is 81 A, relative to the smallest Ie. The trip class is selectable as CLASS 10A, 10E (preset), or 20E per IEC 60947-4-2.

Does Siemens 3RW5056-6AB04 support Modbus communication?

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

Where can I buy 3RW5056-6AB04 soft starter?

Submit an RFQ for current pricing and lead time.

MPN
3RW5056-6AB04