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Siemens 3RW5055-6TB14 — Soft Starters

Siemens 3RW5055-6TB14 Soft Starter, 200-480 V, 68 A, ATEX

MPN3RW5055-6TB14
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Siemens SIRIUS 3RW5055-6TB14 soft starter, 200-480 V, 68 A minimum, Trip Class 10A/10E/20E, ATEX/UKEX/IECEx, PROFIBUS/Modbus/EtherNet/IP, screw fixing.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RW5055-6TB14 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW5055-6TB14 — 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
3RW5055-6TB14 — Control & Connection
ParameterValue
Control supply voltage typeAC
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 outputNo
Auxiliary contact rated current, AC-15 at 250 V3 A
Control supply voltage tolerance, AC 50 Hz (max.)10 %
Control supply voltage tolerance, AC 50 Hz (min.)-15 %
Control supply voltage tolerance, AC 60 Hz (max.)10 %
Control supply voltage tolerance, AC 60 Hz (min.)-15 %
Control supply frequency tolerance (max.)10 %
Control supply frequency tolerance (min.)-10 %
Operating frequency tolerance (max.)10 %
Operating frequency tolerance (min.)-10 %
3RW5055-6TB14 — 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
3RW5055-6TB14 — 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
3RW5055-6TB14 — 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)
3RW5055-6TB14 — 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
3RW5055-6TB14 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

Motor starting profiles and protection

The 3RW5055-6TB14: Soft torque, voltage ramp, and pump ramp down give application-specific starting and stopping profiles — useful for reducing mechanical shock on pumps and preventing water hammer. Minimum operating current is 68 A, so the soft starter is sized for motors drawing at least that full-load current; the rated voltage range 200-480 V covers common low-voltage supplies worldwide.

Hazardous-area and network integration

ATEX, UKEX, and IECEx certification (all Yes) means this soft starter can be installed in explosive atmospheres — Zone 1 or Zone 2 gas, or Zone 21/22 dust, depending on the system enclosure and wiring method. Fieldbus options include PROFIBUS, Modbus RTU, Modbus TCP, and EtherNet/IP, so it ties into most automation networks without a separate gateway. PROFINET with PROFIenergy is available via an optional communication module.

Mounting and environmental limits

Screw fixing to a backplate or mounting rail; clearances: 100 mm upward, 75 mm downward, 10 mm forward, 5 mm sideways for airflow and wiring access. Operating temperature range -25 to +60 °C, with derating required above 40 °C — factor this into the panel thermal design, especially in hot enclosures or near other heat sources. Shock resistance 15 g / 11 ms (12 g / 11 ms with potential contact lifting) means it holds up on vibrating machinery like crushers or compressors without nuisance trips.

Frequently asked questions

What hazardous-area certifications does the 3RW5055-6TB14 carry?

It is ATEX, UKEX, and IECEx certified (all Yes), allowing installation in explosive atmospheres per the applicable system enclosure and wiring rules.

MPN
3RW5055-6TB14