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Siemens 3RW5074-6TB14 — Soft Starters

Siemens 3RW5074-6TB14 Soft Starter, 135 A, 200-480 V, ATEX

MPN3RW5074-6TB14
Active

Siemens 3RW5074-6TB14 soft starter, 135 A minimum, 200-480 V rated, ATEX/UKEX/IECEx certified, trip class 10A/10E/20E per IEC 60947-4-2, screw fixing.

Siemens 3RW5074-6TB14 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW5074-6TB14 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW5074-6TB14 — Power & Motor Rating
ParameterValue
Rated motor power at 400 V (40 °C)160 kW
Rated motor power at 230 V (40 °C)90 kW
Rated operational current at 40 °C315 A
Rated operational current at 50 °C279 A
Rated operational current at 60 °C255 A
Rated insulation voltage600 V
Minimum settable current (% of Ie)15 %; Relative to smallest settable Ie
Power loss during startup (50 °C)2 805 W
3RW5074-6TB14 — 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 %
3RW5074-6TB14 — 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
3RW5074-6TB14 — 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
3RW5074-6TB14 — 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)
3RW5074-6TB14 — 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
3RW5074-6TB14 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 %; non-adjustable

Product details

Hazardous-area certification and overload protection

The 3RW5074-6TB14 carries ATEX, UKEX, and IECEx certification, meaning it is approved for installation in explosive atmospheres — a requirement that narrows the field of soft starters considerably. Trip class is selectable between CLASS 10A, 10E (preset), and 20E per IEC 60947-4-2, which governs the overload protection curve for motor starting — CLASS 10A clears a stall in under 10 seconds at 7.2× Ie, while CLASS 20E allows a longer acceleration ramp for high-inertia loads. Minimum operating current is 135 A, which sets the floor for the motor full-load current the unit can protect — any motor below that FLC requires a smaller frame.

Voltage range and starting profiles

Rated voltage spans 200 to 480 V, covering the common low-voltage motor supplies across 50/60 Hz systems — the control supply accepts 110-250 V at both frequencies. Starting profiles include Soft Torque, Voltage Ramp, and Pump Ramp Down — the pump ramp-down feature reduces water hammer in centrifugal pump applications by extending the deceleration ramp rather than coasting to stop. Auto-reset and remote reset (by cycling the control supply voltage) are supported, allowing the starter to re-engage after a fault without a manual panel visit.

Fieldbus integration and environmental limits

The unit supports PROFIBUS, Modbus RTU, Modbus TCP, and EtherNet/IP — four common industrial protocols — plus PROFIenergy in conjunction with the PROFINET communication module for energy management during idle phases. Shock resistance is 15 g / 11 ms, with potential contact lifting above 12 g / 11 ms — this matters for installations on vibrating machinery or in mobile equipment.

Frequently asked questions

What hazardous-area certifications does 3RW5074-6TB14 carry?

It carries ATEX, UKEX, and IECEx certification, making it suitable for explosive atmospheres where these approvals are required.

What trip classes are available on 3RW5074-6TB14?

Trip class is selectable between CLASS 10A, CLASS 10E (preset), and CLASS 20E per IEC 60947-4-2, allowing the overload curve to match the motor starting time.

MPN
3RW5074-6TB14