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Siemens 3RW4074-6BB35 — Soft Starters

Siemens 3RW4074-6BB35 SIRIUS Soft Starter, 280 A, 50-60 Hz

MPN3RW4074-6BB35

Siemens SIRIUS 3RW4074-6BB35 soft starter, size S12, 280 A at 40 °C, 50-60 Hz, screw fixing, 278 mm depth, 160 mm width, 230 mm height.

$3,149.60Ref. price · indicative, final on quote
Siemens 3RW4074-6BB35 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW4074-6BB35 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW4074-6BB35 — Power & Motor Rating
ParameterValue
Rated operational current at 40 °C280A
Rated operational current at 50 °C248A
Rated operational current at 60 °C215A
Rated insulation voltage600V
Minimum settable current (% of Ie)20%
3RW4074-6BB35 — Control & Connection
ParameterValue
Control supply voltage typeAC
Rated voltage at 50 Hz115V
Rated voltage at 60 Hz115V
Main circuit terminal typebusbar connection
Auxiliary contact rating (UL)B300 / R300
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%
3RW4074-6BB35 — Protection & Features
ParameterValue
Motor overload protectionYes
Thermistor motor protectionNo
Adjustable current limitationYes
Inside-delta connectionNo
Intrinsic device protectionYes
Pollution degree3, acc. to IEC 60947-4-2
3RW4074-6BB35 — Mechanical
ParameterValue
Height230mm
Width160mm
Depth278mm
Mounting positionWith additional fan: With vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back Without additional fan: With vertical mounting surface +/-10° rotatable, with vertical mounting surface +/- 10° t
Fastening methodscrew fixing
Mounting clearance, top100mm
Mounting clearance, bottom75mm
Mounting clearance, side5mm
3RW4074-6BB35 — Environmental
ParameterValue
Operating temperature range-25 ... +60°C
Ambient class during operation (IEC 60721)3K6 (no formation of ice, no 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)

Product details

Mounting and wiring constraints

The 3RW4074-6BB35: Fastening is by screw fixing; the mounting position allows rotation up to +/-90° with an additional fan, or +/-10° without one — this matters when the panel layout forces a non-vertical orientation. Main circuit connections accept busbar or cable: stranded 70–240 mm², finely stranded 50–240 mm², or AWG 2/0–500 kcmil for the main contacts. Envelope dimensions are 278 mm deep, 160 mm wide, 230 mm high — size S12 frame.

MPN
3RW4074-6BB35