Skip to main content
Log in
Siemens 3RW4026-1BB05 — Soft Starters

Siemens 3RW4026-1BB05 Soft Starter, SIRIUS, 25 A, Size S0

MPN3RW4026-1BB05
Active

Siemens SIRIUS 3RW4026-1BB05 soft starter, Size S0, 25 A at 40 °C, 50-60 Hz, 24 V control, screw terminals, integrated bypass, active production.

$320.04Ref. price · indicative, final on quote
Siemens 3RW4026-1BB05 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW4026-1BB05 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW4026-1BB05 — Power & Motor Rating
ParameterValue
Rated operational current at 40 °C25A
Rated operational current at 50 °C23A
Rated operational current at 60 °C21A
Rated insulation voltage600V
Minimum settable current (% of Ie)20%
3RW4026-1BB05 — Control & Connection
ParameterValue
Control supply voltage typeAC/DC
Rated voltage at 50 Hz24V
Rated voltage at 60 Hz24V
Main circuit terminal typescrew-type terminals
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%
3RW4026-1BB05 — 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
3RW4026-1BB05 — Mechanical
ParameterValue
Height125mm
Width45mm
Depth155mm
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 and snap-on mounting
Mounting clearance, top60mm
Mounting clearance, bottom40mm
Mounting clearance, side15mm
3RW4026-1BB05 — 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

SIRIUS 3RW4026-1BB05 — 25 A soft starter with integrated bypass

The unit includes motor overload protection and intrinsic device protection, plus adjustable current limitation to tailor the starting torque to the load.

Panel fit and mounting flexibility

Fastening is by screw or snap-on onto a DIN rail. Mounting position is flexible: with the optional fan, the unit can be rotated ±90° on a vertical surface and tilted ±22.5° front-to-back; without the fan, rotation is limited to ±10°. Clearance requirements: 60 mm above and 40 mm below for airflow, 15 mm at the sides.

Derating and ambient limits

The 25 A rating is at 40 °C ambient; above that derate linearly to 23 A at 50 °C and 21 A at 60 °C. Minimum load is 20 % of the rated current — below that the motor may not start reliably. The maximum motor cable length is 300 m, so long runs from the panel to the motor are fine as long as the voltage drop is accounted for.

Frequently asked questions

What is the 3RW4026-1BB05's rated current at different ambient temperatures?

At 40 °C it is rated 25 A, derating to 23 A at 50 °C and 21 A at 60 °C. The derating temperature threshold is 40 °C — plan your panel ambient accordingly.

Does the 3RW4026-1BB05 have an integrated bypass contactor?

Yes, it includes an integrated bypass contact system that shorts the thyristors after the motor reaches speed, reducing heat dissipation and extending the life of the power electronics.

What mounting positions are allowed for the 3RW4026-1BB05?

With the optional fan, it can be mounted on a vertical surface with ±90° rotation and ±22.5° tilt front-to-back. Without the fan, rotation is limited to ±10°. Clearance: 60 mm above, 40 mm below, 15 mm at the sides.

MPN
3RW4026-1BB05