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Siemens 3RW4055-6BB35 — Soft Starters

Siemens 3RW4055-6BB35 SIRIUS Soft Starter, 134 A, 600 V

MPN3RW4055-6BB35

Siemens SIRIUS 3RW4055-6BB35 soft starter, size S6, 134 A at 40 °C, 600 V insulation, 50/60 Hz, screw fixing, 250 mm depth.

Siemens 3RW4055-6BB35 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW4055-6BB35 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW4055-6BB35 — Power & Motor Rating
ParameterValue
Rated operational current at 40 °C134A
Rated operational current at 50 °C117A
Rated operational current at 60 °C100A
Rated insulation voltage600V
Minimum settable current (% of Ie)20%
3RW4055-6BB35 — 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%
3RW4055-6BB35 — 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
3RW4055-6BB35 — Mechanical
ParameterValue
Height198mm
Width120mm
Depth250mm
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
3RW4055-6BB35 — 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

What the 134 A rating really means for your motor line

The 3RW4055-6BB35: Insulation voltage is rated 600 V, operating frequency 50/60 Hz at 115 V control supply, so it fits standard North American and European motor circuits without a transformer swap. Motor overload protection and intrinsic device protection are built in; adjustable current limitation lets you dial the start current down to 20 % of the motor FLA without external bypass contactors.

Panel space and wire termination — what fits

Dimensions are 198 mm high, 120 mm wide, 250 mm deep — size S6 frame — with screw fixing to the mounting surface, not DIN-rail snap-on. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides — plan your gland plate and busbar routing around these, especially the top clearance for cable bending radius.

Active production — sourcing posture

No official successor or second-source cross-reference from Siemens — the 3RW4055-6BB35 is the active catalog number for this S6 frame, 134 A rating.

Frequently asked questions

What are the key ratings for 3RW4055-6BB35?

Motor overload and intrinsic device protection are built in.

How do I order 3RW4055-6BB35 or check availability?

Sourced to order through independent distribution against your BOM quantity. Submit an RFQ for current lead time and pricing — availability is confirmed at quote time.

MPN
3RW4055-6BB35