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Siemens 3RW5056-2TB05 — Soft Starters

Siemens 3RW5056-2TB05 Soft Starter, 81 A Min, 200–600 V

MPN3RW5056-2TB05
Active

Siemens 3RW5056-2TB05 soft starter, 81 A minimum operating current, 200–600 V supply voltage, trip class 10A/10E/20E per IEC 60947-4-2, ATEX/UKEX/IECEx certified, 120 x 198 x 249 mm screw-fixed mounting.

Siemens 3RW5056-2TB05 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW5056-2TB05 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW5056-2TB05 — 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
3RW5056-2TB05 — 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
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 %
3RW5056-2TB05 — 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
Intrinsic device protectionYes
Pollution degree3, acc. to IEC 60947-4-2
3RW5056-2TB05 — 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
3RW5056-2TB05 — 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)
3RW5056-2TB05 — 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
3RW5056-2TB05 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

Active production, multi-protocol fieldbus

The 3RW5056-2TB05: Fieldbus integration covers PROFIBUS, Modbus RTU, Modbus TCP, EtherNet/IP, and PROFINET standard, with PROFIenergy support when paired with the PROFINET communication module. This allows the starter to participate in energy management and coordinated start sequences on a single network.

Explosion-protected area deployment

The unit holds ATEX, UKEX, and IECEx certification, qualifying it for installation in potentially explosive atmospheres where standard soft starters would be prohibited. This is a key differentiator for sites governed by the ATEX Directive 2014/34/EU or IECEx Scheme. North American market acceptance is confirmed by UL and CSA approvals.

Mounting and physical integration

Dimensions are 120 mm width, 198 mm height, 249 mm depth. Fastening method is screw fixing — no DIN-rail clip. Mounting position allows a vertical surface with +/-90° rotation and +/-22.5° tilt forward/backward, giving flexibility in panel layout but requiring dedicated screw holes. Clearance requirements: 100 mm upwards, 75 mm downwards, 10 mm forwards, 5 mm sideways, 0 mm backwards. These minimums must be maintained for airflow and service access — a panel designed for a different starter may need re-spacing.

Application-specific starting profiles

Soft torque, voltage ramp, and pump ramp down are built-in functions. Pump ramp down reduces the deceleration rate to prevent water hammer in pumping systems — a common failure mode in water/wastewater installations. Remote reset is available by cycling the control supply voltage. Minimum load is 15 % of the smallest settable Ie, ensuring the starter can handle lightly loaded motors without nuisance tripping. Auto-reset is supported for unattended restart after a fault clears.

Sourcing and compliance documentation

Compliance documentation includes CE marking, UL, CSA, ATEX, UKEX, and IECEx certificates. The unit is classified under product category 'Hybrid switching devices' and carries a service factor of 1.

Frequently asked questions

What compliance certifications does the 3RW5056-2TB05 carry?

It carries ATEX, UKEX, IECEx, CE, UL, and CSA approvals. This qualifies it for explosive atmospheres per ATEX Directive 2014/34/EU and for North American installations requiring UL/CSA listing.

Can the 3RW5056-2TB05 replace a 6ED1052-1MD08-0BA1 in an existing panel?

No direct drop-in replacement is confirmed. The 6ED1052-1MD08-0BA1 is a LOGO! logic module, not a soft starter — the two serve different functions. The 3RW5056-2TB05 requires screw fixing and specific clearance zones (100 mm up, 75 mm down) that differ from a DIN-rail-mounted controller.

MPN
3RW5056-2TB05