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Siemens 3RW4423-3BC36 — Soft Starters

Siemens 3RW4423-3BC36 SIRIUS Soft Starter, 62 A at 40 °C

MPN3RW4423-3BC36

Siemens SIRIUS soft starter, 3RW4423-3BC36, 62 A at 40 °C, 690 V insulation voltage, integrated bypass.

$2,116.00Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW4423-3BC36 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW4423-3BC36 — Power & Motor Rating
ParameterValue
Rated operational current at 40 °C62A
Rated operational current at 50 °C55A
Rated operational current at 60 °C50A
Rated insulation voltage690V
Minimum settable current (% of Ie)8%
3RW4423-3BC36 — Control & Connection
ParameterValue
Control supply voltage typeAC
Rated voltage at 50 Hz115V
Rated voltage at 60 Hz115V
Main circuit terminal typebox terminal
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%
Operating voltage tolerance, inside-delta (max.)10%
Operating voltage tolerance, inside-delta (min.)-15%
3RW4423-3BC36 — Protection & Features
ParameterValue
Motor overload protectionYes
Thermistor motor protectionYes
Adjustable current limitationYes
Inside-delta connectionYes
Intrinsic device protectionYes
Pollution degree3, acc. to IEC 60947-4-2
3RW4423-3BC36 — Mechanical
ParameterValue
Height192mm
Width170mm
Depth270mm
Mounting positionwith vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back
Fastening methodscrew fixing
Mounting clearance, top100mm
Mounting clearance, bottom75mm
Mounting clearance, side5mm
3RW4423-3BC36 — Environmental
ParameterValue
Operating temperature range60°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

It uses thyristor technology and includes an integrated bypass contact system, which means the bypass contactor carries the full-load current after the start, reducing heat dissipation in the soft starter during continuous operation.

The 62 A rating applies at 40 °C ambient. The derating temperature threshold is 40 °C, so no reduction is needed below that.

Motor protection and control features

The minimum load is 8% of the rating, which covers small pumps and fans. The inside-delta circuit configuration is supported, which reduces the soft starter current rating to 58% of the motor FLA for delta-connected motors — a common wiring scheme to downsize the starter.

Screw fixing is the fastening method. Clearance distances: 100 mm upward, 75 mm downward, 5 mm at the sides. Main current circuit uses box terminals accepting stranded 2x (4 to 50 mm²) or solid 2x (0.25 to 1.5 mm²). Auxiliary and control circuits use spring-loaded terminals for 2x (24 to 16 AWG). Maximum wire length to the motor is 500 m.

The operating frequency is 50 to 60 Hz.

Frequently asked questions

What are the key ratings for this soft starter?

Rated 62 A at 40 °C, derating to 55 A at 50 °C and 50 A at 60 °C. Insulation voltage 690 V. Operating frequency 50/60 Hz. Control supply 115 V at both frequencies. Integrated bypass and adjustable current limitation.

What wiring terminals does it use?

Main circuit uses box terminals for stranded 2x (4 to 50 mm²) or solid 2x (0.25 to 1.5 mm²). Auxiliary and control circuits use spring-loaded terminals for 2x (24 to 16 AWG).

What clearance distances are required around the unit?

100 mm upward, 75 mm downward, and 5 mm at the sides for proper ventilation and access.

MPN
3RW4423-3BC36