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Siemens 3RW4036-1TB04 — Soft Starters

Siemens 3RW4036-1TB04 SIRIUS Soft Starter, 45 A, 24 V

MPN3RW4036-1TB04
Active

Siemens SIRIUS 3RW4036-1TB04 soft starter, size S2, 45 A at 40 °C, 24 V AC/DC control, screw terminals, integrated bypass contact system.

$543.56Ref. price · indicative, final on quote
Siemens 3RW4036-1TB04 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW4036-1TB04 — Identification
ParameterValue
Product designationSoft starter
Product brand nameSIRIUS
3RW4036-1TB04 — Power & Motor Rating
ParameterValue
Rated operational current at 40 °C45A
Rated operational current at 50 °C42A
Rated operational current at 60 °C39A
Rated insulation voltage600V
Minimum settable current (% of Ie)20%
3RW4036-1TB04 — 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%
3RW4036-1TB04 — Protection & Features
ParameterValue
Motor overload protectionYes
Thermistor motor protectionYes
Adjustable current limitationYes
Inside-delta connectionNo
Intrinsic device protectionYes
Pollution degree3, acc. to IEC 60947-4-2
3RW4036-1TB04 — Mechanical
ParameterValue
Height160mm
Width55mm
Depth170mm
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, side30mm
3RW4036-1TB04 — 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

45 A at 40 °C — what it means for the motor branch

The 3RW4036-1TB04: An integrated bypass contact system means the thyristors are shorted out once the motor reaches full speed; the bypass carries the running current, not the semiconductors, which eliminates continuous conduction losses and keeps the enclosure cooler. Adjustable current limitation and integrated motor overload protection (class 10/20 electronic overload relay) cover the branch protection without a separate overload relay — one device handles the soft-start ramp and the running protection.

Size S2 — panel layout and wiring constraints

Main circuit terminals accept stranded wire up to 2x 25 mm² (or solid 2x 2.5 mm²) via screw-type terminals — sufficient for 45 A branch circuits without parallel conductors. Mounting position is flexible: with an additional fan, the unit can be rotated ±90° on a vertical surface or tilted ±22.5°; without a fan, the allowed rotation is ±10° — important for tight enclosures where airflow direction matters.

Frequently asked questions

What is the maximum motor cable length for this soft starter?

The maximum motor cable length is 300 m — long enough for most motor branch circuits in industrial plants without needing an output reactor for reflected-wave suppression.

Does the 3RW4036-1TB04 need an external bypass contactor?

No — the integrated bypass contact system handles the running current after the start ramp, so no external contactor is required. The thyristors only conduct during the acceleration phase.

MPN
3RW4036-1TB04