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Siemens 3RW4055-6BB34 — Soft Starters

Siemens 3RW4055-6BB34 SIRIUS Soft Starter, 134 A, 600 V

MPN3RW4055-6BB34

Siemens SIRIUS 3RW4055-6BB34 soft starter, size S6, 134 A at 40 °C, 600 V insulation, 50/60 Hz, adjustable current limitation, motor overload protection.

Siemens 3RW4055-6BB34 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW4055-6BB34 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW4055-6BB34 — 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%
3RW4055-6BB34 — 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%
3RW4055-6BB34 — 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
3RW4055-6BB34 — 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
3RW4055-6BB34 — 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

134 A at 40 °C — current derating drives the panel sizing

The 3RW4055-6BB34: Insulation voltage rated 600 V, operating frequency 50/60 Hz. Pollution degree 3 per IEC 60947-4-2 means the soft starter is designed for the conductive dust and humidity typical of industrial control panels, not clean-room or office environments.

Wiring and mounting — size S6, busbar or lug

For auxiliary contacts, 2x (20 … 14) AWG. Mounting position allows vertical surface with +/-90° rotation and +/-22.5° tilt (with additional fan) or +/-10° rotation without fan. Dimensions: 250 mm depth, 120 mm width, 198 mm height. Screw fixing.

Adjustable current limitation and motor protection

Built-in motor overload protection and intrinsic device protection — the soft starter monitors the motor current and trips on overload without an external relay. Adjustable current limitation lets you set the starting current between 20% and the rated value. External reset input allows remote fault reset, useful in unattended or remote installations. Maximum motor cable length 300 m.

MPN
3RW4055-6BB34