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Siemens 3RW5073-6TB15 — Soft Starters

Siemens 3RW5073-6TB15 Soft Starter, 100 A min, ATEX

MPN3RW5073-6TB15
Active

Siemens 3RW5073-6TB15 SIRIUS soft starter, 100 A minimum setting, 200–600 V rated voltage, ATEX and IECEx certified, trip class 10A/10E/20E, PROFIBUS/Modbus/EtherNet/IP, screw fixing.

Siemens 3RW5073-6TB15 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW5073-6TB15 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW5073-6TB15 — Power & Motor Rating
ParameterValue
Rated motor power at 400 V (40 °C)132 kW
Rated motor power at 230 V (40 °C)75 kW
Rated operational current at 40 °C250 A
Rated operational current at 50 °C220 A
Rated operational current at 60 °C200 A
Rated insulation voltage600 V
Minimum settable current (% of Ie)15 %; Relative to smallest settable Ie
Power loss during startup (50 °C)2 043 W
3RW5073-6TB15 — 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 %
3RW5073-6TB15 — 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
3RW5073-6TB15 — Mechanical
ParameterValue
Height230 mm
Width160 mm
Depth282 mm
Weight7.3 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
3RW5073-6TB15 — 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)
3RW5073-6TB15 — 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
3RW5073-6TB15 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

Soft starter for hazardous-area motor control

The 3RW5073-6TB15: Its ATEX and IECEx certifications (Yes) mean it can be installed in Zone 1 or Zone 2 gas atmospheres and Zone 21 or Zone 22 dust atmospheres — the soft starter itself is not an ignition source during normal operation or under expected fault conditions. Trip class is selectable between CLASS 10A, 10E (preset), and 20E per IEC 60947-4-2. CLASS 20E extends the trip time to 20 seconds, accommodating high-inertia loads like centrifuges or large fans that need a longer acceleration ramp without nuisance tripping.

Fieldbus integration and control flexibility

This soft starter supports PROFIBUS, Modbus RTU, Modbus TCP, and EtherNet/IP natively — no separate communication module needed for these protocols. PROFINET with PROFIenergy is available via an optional communication module. The voltage ramp and soft torque features reduce mechanical shock on coupled loads — the ramp shape is adjustable to match pump, conveyor, or compressor start profiles. Pump ramp down provides a controlled deceleration to prevent water hammer in piping systems. Auto-reset and remote reset (by cycling the control supply voltage) allow unattended restart after a fault clears — useful for remote or unmanned installations where manual reset is impractical.

Mounting, environment, and approvals

Mounting is screw fixing with a vertical surface orientation; the unit can be rotated ±90° or tilted ±22.5° forward/backward. Clearance requirements: 100 mm upwards, 75 mm downwards, 10 mm forwards, 5 mm at the sides, 0 mm backwards — plan the enclosure layout accordingly for airflow and cable entry. Shock resistance is 15 g / 11 ms, with potential contact lifting above 12 g / 11 ms. Approvals include CE marking, UL approval, and CSA approval — accepted in European, US, and Canadian electrical installations without additional certification work.

Frequently asked questions

What ATEX certification does the 3RW5073-6TB15 carry?

ATEX certification is listed as Yes, along with IECEx. This qualifies the soft starter for installation in potentially explosive atmospheres — the unit itself is not an ignition source under normal or expected fault conditions per the ATEX directive.

What is the minimum current setting on the 3RW5073-6TB15?

The minimum settable current is 100 A. The minimum load is 15 % relative to the smallest settable Ie, meaning the soft starter can control motors drawing as little as 15 A if the full-scale range is set appropriately.

MPN
3RW5073-6TB15