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Siemens 3RW5126-1XC14 — Soft Starters

Siemens 3RW5126-1XC14 SIRIUS Soft Starter, 32 A, 200-480 V

MPN3RW5126-1XC14

Siemens SIRIUS 3RW5126-1XC14 soft starter, 32 A minimum, 200-480 V, trip class 10A/10E/20E, PROFIBUS, Modbus RTU, PROFINET, screw terminals, 185 x 203 x 321 mm.

Siemens 3RW5126-1XC14 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RW5126-1XC14 — Identification
ParameterValue
Product brand nameSIRIUS
3RW5126-1XC14 — Power & Motor Rating
ParameterValue
Rated motor power at 400 V (40 °C)37 kW
Rated motor power at 230 V (40 °C)22 kW
Rated operational current at 40 °C133 A
Rated operational current at 50 °C118 A
Rated operational current at 60 °C107 A
Rated insulation voltage480 V
Minimum settable current (% of Ie)15 %; Relative to smallest settable Ie
Power loss during startup (50 °C)933 W
3RW5126-1XC14 — Control & Connection
ParameterValue
Control supply voltage typeAC
Main circuit terminal typebox terminal
Control circuit wire range, solid1x (0.5 ... 4.0 mm²), 2x (0.5 ... 2.5 mm²)
Control circuit wire range, finely stranded (with ferrule)1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.5 mm²)
Analog outputYes; 4 ... 20 mA (default) / 0 ... 10 V (parameterizable with High Feature HMI)
Auxiliary contact rated current, AC-15 at 250 V3 A
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 %
3RW5126-1XC14 — Protection & Features
ParameterValue
Motor overload protectionYes
Adjustable current limitationYes
Inside-delta connectionYes
Intrinsic device protectionYes
Pollution degree3, acc. to IEC 60947-4-2
3RW5126-1XC14 — Mechanical
ParameterValue
Height321 mm
Width185 mm
Depth203 mm
Weight5.6 kg
Mounting positionwith vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back
Fastening methodscrew fixing
Mounting clearance, top100 mm
Mounting clearance, bottom75 mm
Mounting clearance, side5 mm
Mounting clearance, front10 mm
3RW5126-1XC14 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C; Please observe derating at temperatures of 40 °C or above
Storage / transport temperature range-40 ... +80 °C
Max. installation altitude5 000 m; Derating as of 1000 m, see catalog
3RW5126-1XC14 — Specifications
ParameterValue
Trip ClassCLASS 10A (default) / 10E / 20E; acc. to IEC 60947-4-2
Number Of Controlled Phases3
Product Feature Integrated Bypass Contact SystemNo
Start-Up Ramp Time Of Soft Starter0 ... 20 s
Ramp-Down Time Of Soft Starter0 ... 20 s
3RW5126-1XC14 — Electrical
ParameterValue
Current Limiting Value [%] Adjustable130 ... 700 %
Starting Voltage [%]30 ... 100 %
Stopping Voltage [%]50 ... 50 %

Product details

Trip class and starting profile

The 3RW5126-1XC14: Trip class is selectable: CLASS 10A (default), 10E, or 20E per IEC 60947-4-2 (cite:). Starting voltage is adjustable 30–100 % (cite:); stopping voltage fixed at 50 % (cite:). The voltage ramp and soft torque functions (cite:,) let the commissioning engineer tune the acceleration profile to the load without mechanical shock.

Panel fit and environmental limits

Mounting is screw fixing (cite:) with a vertical surface orientation; the unit is rotatable ±90° and tiltable ±22.5° front/back (cite:). Clearance requirements: 100 mm upwards, 75 mm downwards, 10 mm forwards, 5 mm at the side, 0 mm backwards (cite:,). Pollution degree 3 per IEC 60947-4-2 (cite:) means the unit tolerates conductive dust and occasional condensation — typical for industrial enclosures without climate control.

Control and diagnostics

The unit includes a standard HMI and a High Feature HMI (cite:,). Analog output is configurable as 4–20 mA (default) or 0–10 V when the High Feature HMI is used (cite:). An error logbook (cite:) and firmware update capability (cite:) are built in — no external programming tool required for routine parameter changes. Auto-reset and remote reset (by cycling the control supply voltage) are supported (cite:,). The minimum load is 15 % of the smallest settable Ie (cite:), which covers lightly loaded motors without nuisance tripping.

Frequently asked questions

What is the trip class and how does it affect motor starting?

The trip class is selectable: CLASS 10A (default), 10E, or 20E per IEC 60947-4-2 (cite:). CLASS 20E gives a longer ramp window for high-inertia loads.

What fieldbus protocols does 3RW5126-1XC14 support?

It supports PROFIBUS, Modbus RTU, and PROFINET standard (cite:,). This allows direct integration into Siemens S7 and third-party control networks without additional communication modules.

MPN
3RW5126-1XC14